My football practice was cancelled last night so I headed to the gym instead of doing sprints at the field by myself. I went with the intention of trying one crossfit program I saw a trainer at the gym doing the day before. He mentioned he isnt' playing sports at the moment and that these crossfit programs keep him comptetive with himself and busy 3 days a week. So last night I did the following: 15 rep deadlift @ 154 pounds 15 body squats 15 standing military press with 45 pound dumbells in each hand 15 dumbell swings with a single 45 pound dumbell 15 push ups (nose touching the ground to lockout) X 5 Basically, you run through the 5 excersizes 5 times not stopping, unless you have to ofcourse. It took me 15:34 my first time. I just wanted to finish. The trainer who regularly does this (much smaller than me) completed in under 11 minutes the day before. Hardest cardio, anarobic, aerobic work I have done in a long time. I almost past out and was light headed for a while after. I would recommend this to athletes looking to build muscle endurance as well as cardiovascular endurance ofcourse.