How about doing your leg exercises in 3 sets of 7 each side, alternating between the legs with no rest, first set concentrate on strength, 2nd go for speed, and 3rd for explosiveness with a little hop? Keeping the rest between sets and exercises as short as possible will really challenge your endurance...

Thanks guys. Great idea to focus on more endurance style training. I am trying to get under 4 hours and am somewhat slow, so to work on my explosiveness maybe I will do 20 reps of exercises with the first half regular reps and the second half adding a jump or more speed. Depending on how many leg exercises...

Mike: You beat me to the punch on this one. While i was off considering what to suggest you went and suggested what i'd thought of. Kim: I think should concentrate on endurance rather than strength for the leg exercises. If you do a a large number of reps & sets, with little rest you should really...

Hey everyone, Just got admitted to the NYC marathon (guess I better start training :-). The program I am following is 3-4 days a week of running which leaves me 3 days to strength train/cross train on the TRX. Any suggestions on a good TRX routine to do on the strength training days to get me marathon...