http://community.fitnessanywhere.com/blogs/trx_mfp/archive/2008/03/15/week-4-strength-workout-1.aspxWhile there are no changes to the general program structure in week 4, there are a number of new things to hone in on while doing the exercises. During the TRX Single Leg Squat be sure to keep the body weight over the foot. The goal is to use the TRXenCommunityServer 2007.1 SP2 (Build: 31113.47)