World's Ultimate 20-Minute Home Workout  A TRX Suspension
Trainer workout to fine-tune the core muscles your body calls
upon late in a race.  Sprinter's Start with Knee-Up     Photo:
Inga Hendrickson  When the TRX Suspension Trainer first came
out, in 2005, it quickly became a cult hit among gym rats for
its deep library of strength exercises and its ultra-
portability—allowing you to work out anywhere from a hotel room
to a beach with one palm tree ($190; But more recently, elite
endurance athletes like 2009 Ironman runner-up Chris Lieto have
begun turning to the system to supercharge traditional body-
weight strength routines. TRX uses a pair of straps hanging from
a door or beam to slightly destabilize your body as you run
through variations of classic lunges, push-ups, and crunches,
fine-tuning the stabilizing muscles your body calls upon late in
a race. "The TRX forces you to strengthen muscle as it relates
to the movements you'd be doing in your sport," says Matt Dixon,
Lieto's coach. "It makes it more re