I recommend the http://www.rest-timer.com Great for making the workout more interesting and helps to reinvigorate you. Good stuff. and cheap too.

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...