Intensity techniques are not for everybody. Beginners definitely do not need them. They allow the trainer to go beyond conventional failure in order to work the muscle harder, providing a stimulus to get larger and stronger.
You can try using several techniques in one set if you really want to work yourself. These should not be done every workout.
Amazing Muscles Booster Forced Reps Tips
Forced Reps Weight Training
That unusual high training level has a high impact on muscles, unfortunately mostly on the edge of over-training. It takes a lot of experience to it effectively. The training partner has to have some experience too, because it is not easy to estimate the correct balance of necessary support.
Use forced reps sporadically, such as when you need to switch things up for your workout routine or when you need to break out of your weight lifting plateaus.

An example of forced reps:
Bench Press involving Forced Reps – You easily knock out 8 reps, but fail on the 9th rep with the weight halfway off your chest. At that point you continue pushing as your training partner provides as little help as possible until the rep is completed.
Limit forced repetitions to two or three sets per target area. For example, if you are training chest and using the bench press, incline press, and flat bench flys for a workout, use a set of forced reps on the last heavy set of bench presses and incline presses. During the rest of the workout, perform the work sets only to positive failure.

The Technique Directory
The following is a list of intensity techniques and how to use them. For each technique, I will explain them all in detail and give you the benefits of using that specific technique.
Forced Reps
Drop Sets
Giant Sets :: Jump Sets
2-Up 1-Down Negatives
Strip Sets
Rep Targeting
Heavy Supports 

Forced Reps
This is the most popular and consequently the most abused intensity technique. A spotter is used to provide enough assistance for the trainer to be able to complete the rep.
The abuse comes when the trainer relies on the spotter for assistance during most of the set.
The most obvious example is the bench press.
Forced reps should not be done every set like some trainers do. Properly executed forced reps are very demanding and can severely tax your recovery systems.
Spotters should also provide only just enough help to keep the weight moving. They should not take the weight away from the trainer. 

Partials can also be done at the end of a set to extend it. Continue with the same weight but do partial reps, shortening the range of motion more as you tire until you are just doing lockouts.
Pure partials are often done in the power rack with the pins set at appropriate levels. Partial squats are done with the pins in the rack set near the top of the range of motion. Moving the bar only a few inches with a huge amount of weight on your back, is a great way to build power, density, and confidence.
Partials can be done anywhere in an exercise's range of motion. They can help you get through sticking points if you do partials at and through the sticking point. The heavy weight is very useful for building tendon and ligament strength. Sometimes when you hit a plateau, it is not due to muscle strength but connective tissue strength. Partials can help overcome this.
Partials can be done in a continuous without taking tension off the muscles, or in brief reps, allowing the weight to be supported on the racks for a few moments before doing the next rep. The continuous style provides more muscle tension but reduces the amount of weight that can be used. Don't bounce the bar off the pins. Develop tension in the muscles gradually so you don't jerk anything out of the sockets.
If you use a lot of partial movements, it is very important to stretch after each set. It is also a good idea to finish with a set that takes the muscle through a full range of motion. A static hold and a negative is a good way to do this as it keep a lot of tension on the muscle all the way through the entire range of motion. Hold in the stretch position for as long as possible at the bottom of the movement. 

Pre-Exhaust Training
Do a set of an isolation exercise for a muscle group, then, with no rest, do a compound movement for it, e.g. dumbbell flyes then barbell bench press. This fatigues the target muscle then allows the fresher secondary movers push the target muscle harder.
A variation of this is the pre-exhaust giant set. A good example is triceps, shoulders and chest. This variation will push the triceps to the limit, and work the shoulders hard.
Start with a triceps isolation exercise such as pushdowns.
Go to shoulder press, which works triceps and shoulders.
Next, do bench press, which works the triceps, shoulders and chest. 
Each progressive set will allow another muscle group to continue assisting. For lower body, try it with hamstrings. Start with leg curls which isolate the hams then move to stiff-legged deadlifts, which work the hams and glutes, then move to lunges which work the hams, glutes and quads.
The pre-exhaust concept can be extended to an entire workout. If you wish to push your triceps harder, try doing them first, followed by chest. You may limit your chest workout but your triceps will be pushed a lot harder by doing chest first. This can be applied to biceps and back, shoulders and chest, or calves and thighs.

At the end of a set, when you can't do any more reps with good form, use a bit of body swing or momentum to help get the weight past the sticking point, e.g. swinging the weight up a little at the start of a barbell curl.
Do not cheat excessively or you may cause injury.
Cheat only to work the muscle harder, not to make the exercise easier. 

Drop Sets
This entails doing a set to failure with a weight then immediately doing another set to failure with a lighter weight. This can be done as double-drop (reduce the weight once), triple-drop (reduce the weight twice), or down-the-rack (use every consecutive set of dumbbells down a rack) sets.

Down The Rack Drop Set
If you are doing laterals for your shoulders, start with a weight you can get six reps for, then pick up the next lightest set of dumbbells and go again. Repeat this procedure until you get to the lightest dumbbells that you wish to use.
This idea works well with selectorized machines. Simply just keep raising the pin to the next lightest weight. Don't feel confined to drop only one notch or dumbbell. You may drop two notches or skip a pair of dumbbells. This can depend on the exercise. You may finish a set with very heavy weight and may be unable to do another rep with the next lightest weight, as it is still very heavy.
It is also not necessary to stick to a set number of reps during the drops (e.g. get 6 reps on every drop). You can try doing one rep with each drop or do as many as it takes to fail at each drop. Obviously, the lighter the weight gets, the more reps you will be able to do. 

Variation Triple Drop Sets
Do the first set with the strongest variation of an exercise (e.g. decline bench press) and go for power. Do the second drop with the next strongest variation
(e.g. flat bench press) and go for feeling the muscle. Do the third drop with the weakest variation (e.g. incline bench press) and use very strict form. You can also do that backwards and start with the weakest variation first.

Fiber Triple Drop Sets
This type of triple drop set works three different ways.
1. The first set of the drop, use a very heavy weight (about 85-90% 1RM) and do 2 to 3 reps with it. This will work on relative strength and connective tissue strength.
2. For the second drop, use a weight that allows 8 to 10 reps. This builds muscle mass and circulation.
3. For the third drop, use a very light weight and do 6 to 8 fast, explosive reps (one second up, one second down). This will work the explosive fibers and the neuromuscular system. Another option on the last set is to do a set of very high reps with a very light weight (30 plus). 
Note: Plate loaded machines are very useful for drop sets as there are no pins used and the weight can be changed anywhere in the movement without losing any tension and without disturbing the set. A partner is required to effectively use this type of drop setting.

Rest-Pause Training
1. Do a set to failure.
Rest-Pause Training works very well for high rep training as well when lactic acid burn forces you to stop. Do a set of calf raises until you can't take the pain, rest for a few seconds and shake out your legs to allow the lactic acid to be cleared somewhat, then do more reps until you seize up again. Shake it out and continue. This allows you to push to muscular failure instead of lactic acid failure.


Same Part Supersetting

Isolation/Compound Supersetting

Antagonistic Supersetting
It also makes you stronger in both.

Superset different exercises

Giant Sets
Do several exercises for one bodypart in a row without resting in between exercises, e.g. chin-ups, seated rows, straight arm lat pushdowns, then lat pull downs. You can do the same exercise more than once within the giant set as well. Try doing the exercises in the order of midrange, stretch then contracted position for a huge pump.

Variation Giant Sets
Use variations of the same exercise starting with the weakest version and going to the strongest, using the same weight. An example is wide grip pulldowns to reverse close grip pulldowns to regular close grip pulldowns.

Jump Sets
This is a way of doing a large number of heavy sets for several muscle groups without losing as much strength from set to set. For example, if you plan on doing 5 sets of chin-ups and 5 sets of bench, start with 3 sets of chin-ups, then 3 sets of bench, then go back and do your remaining 2 sets of chin-ups and 2 sets of bench. The extra rest will allow you to be stronger on your last 2 sets than you normally would.
Jumping between antagonistic muscle groups also seems to benefit strength. This can also be done going back and forth on every set instead of groups of sets. But, this is not a superset, it enhances recuperation by giving more rest to the bodyparts in the same workout time. This allows you to do more weight for each exercise.
Jump sets are best used on antagonistic bodyparts such as back and chest, biceps and triceps, or hamstrings and quads.

These are typically done in the stretch or contracted positions. They are small, fast movements at the end of a set to finish off the muscle. These are most often seen in calf raises. Just bounce up and down in the bottom position at the end of a set until your calves burn.

Strip Sets
These are done with barbells. Do a set then, without racking the bar, get two spotters to pull off a preset amount of weight. Continue with that weight. Keep stripping as desired. This will thoroughly burn out a muscle. It is similar to drop sets, but there is absolutely no rest.

This technique focuses on the negative portion of muscle contraction (the eccentric or lowering phase).
Use about 10% heavier than your.
To really get the feel for a proper negative, you must not just allow the weight to lower, you must actively push (or pull) against it, fighting it all the way down. It is like you are trying to do a positive rep but aren't.
Another way to do negatives is to do the positive normally then get your spotter to add to the resistance on the way down by leaning on the bar or pulling down on it.
Do focused negative work at the beginning of your bodypart work when you are at your strongest. 

2 Up - 1 Down Negatives
This is a variation of negative training that is best done with machines.
Use two arms or legs for the positive phase then lower it using only one arm or leg.
This type of negative training is useful if you do not have a partner to work with.
When using this technique, you can alternate arms/legs or do the complete set of reps with the one arm/leg, then the complete set of reps with the other arm/leg.
To really max out, follow the negative sets with a static hold with both limbs. 

This is similar to the drop set and strip set technique but doesn't require changing weights or using spotters. The example will be barbell curls:
1. Load a barbell then put a collar on.
2. Add a few more small plates outside the collar.
3. Pick up the barbell and hold some elastic cables in addition to the bar.
4. Go to failure with all that then let go of the cables.
5. Go to failure again then allow the loose plates to slide off.
6. Go to failure with the rest. 

Rep Targeting
Set a target of a certain amount of reps and get that target of reps no matter how many sets it takes you to get there. For the example we will use chin-ups:
1. Pick a target of 50 reps on chin-ups, say you get 30 on the first set.
2. Rest a little while 10 to 30 seconds.
3. Do another set, say you get 10 reps.
4. Rest.
5. Get 5 reps.
6. Rest.
7. Get 3 reps.
8. Rest.
9. Get 2 reps.
10. Done. 
A different version of this is do this is time subtraction. The amount of time you rest between sets is the amount of reps you have left to get to your target.
For example, your target is 50, you get 30 reps, your rest period is 20 seconds. The next set you get 10 reps. That leaves you with 10 reps to go, you rest 10 seconds and go again. You get 4 reps, you have 6 left, rest 6 seconds.

Heavy Supports
This is simply holding a weight in the lockout position of an exercise for as long as possible. An example of this would be just standing there with a huge weight on your back. This would be a squat support. These are best done in the big movements like bench, squats, deadlift, dips, shoulder press, etc. because of the amount of weight that can be supported.
These will build connective tissue strength as well as increasing muscle density and confidence. After holding a thousand pounds on your back, squatting with three plates won't seem quite so daunting.

Now that you've had a look through these techniques, check out my other intensity article, Intensity Techniques That Will "Kill" You AND Make You Stronger, that details 8 incredible completely-new or rarely-used intensity techniques.

Forced Reps: Going Heavy!
How important is it to go heavy? I suppose every bodybuilder is entitled to their own ridiculous opinion. In my opinion, it is the one thing that I am most consumed about throughout my workouts. If you want to grow, you gotta go heavy. 
Now, I will use the Incline Bench Press as an example because it is an underused movement by many gym warriors. Let's say I've hit a plateau with 185 lbs for 6 reps.

What's A Plateau?
The next time I train chest, I will slap on 185 lbs on the incline press (after my warmup, of course). Then my partner will keeps his hands on the bar on each and every rep. Not only will he assist with a tiny fraction of the weight, but his hands on the bar will give you a sense of safety and confidence.
This will allow you to perform more reps. If you performed this correctly, you should have been able to bang out at least 9 reps. Bam! You've blasted your pecs to new heights and destroyed your plateau.

Busted Plateaus!
So, let's say that you apply this theory and get to the point of incline pressing 250 lbs for 6 reps. On your next chest day, your partner is ill and cannot make it. You are forced to train by yourself. Being the intelligent creature you are, you warm-up and then proceed to put on a weight that is less than 250 lbs, but more than 200 lbs.
The theory is basically applying forced reps to each and every set to gain strength, confidence, and muscle mass. I guarantee that you will be able to bang these reps out with ease, even without a spotter.

The Few & Far Between: Good Spotters! The Few & Far Between: Good Spotters! 
I warn you that this program isn't for everyone. You may grow to like it and become dependent upon it, as I have! Your gains will begin to come more easily than you ever thought in your wildest imaginations. Combine this training theory using forced reps with an intensity and a good diet, and you are sure to get stronger.
Remember that with increased strength, comes increased muscle mass. It's a simple equation. Train hard, train smart, and keep it natural!
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