WOD 7.28.11

WOD:
4 rounds for time of:
Perform as many reps as possible in 1 minute of the following:
Med balls slams, 40lbs/20lbs/
Box jumps, 20 inches/
Hang power snatch, 75lbs/
Sit-ups

Move from movement to movement as quickly as possible; after 4 minutes, rest one minute before moving to the next round.