Larry started a fitness program about 8 weeks ago. he runs 2 miles every day and does some weight training. he likes to use weight machines and focuses on 1 or 2 muscle groups each day. he could initially do 6 repetitions of most exercises in his program, and he can now do 15-20. larry likes the initial improvement in his energy level and appearance since starting the program. he has noticed that his work in construction seems a little easier, too. however, larry doesn't think he is getting as much benefit out of his program now as he did at the start of his fitness program. all of the following can larry decrease his risk of injury, except alternating jogging and another endurance activity in his program (cross-training). allowing muscle groups a day of rest between strength training workouts. warming up thoroughly before both endurance and strength training sessions. exercising at maximum heart rate during endurance training.