True-true - sometimes. if your primary goal is a good cardio workout, then do it first. if strength is the priority, then do it first (but warm up with some light to moderate cardio training for about 10 minutes).what if cardio and strength are of equal priority? it may be better to start with strength training so that you dont fatigue your muscles and deplete your body of valuable fuel sources.in a study, participants did cardio exercise then took a break. they had a 25 percent decrease in the number of repetitions they were able to perform after a four-hour break and a 9 percent decrease after an eight-hour break.if you are trying to improve your strength and save time by combining cardio and strength workouts in one session, you will get better results (less fatigue, more complete recovery, and greater strength gains) by performing strength training first.better yet: do cardio and strength training on alternate days.