Apparently I’ve been exercising all wrong. According to my teenage son, who fancies himself an expert on fitness, there are three phases of strength training one ought to do in order to maximize the benefits. Silly me, I’d just been following the number of reps and sets suggested in my program, gradually increasing the amount of weight for each exercise. But my son set me straight. One ought to rotate strength, hypertrophy, and endurance workouts for the best results. With a strength workout, you add as much weight as possible, enough that you can only lift 2-6 reps for each set. Hypertrophy is the “normal” workout, where you do 8-12 reps with a challenging but doable amount of weight. And endurance is a slightly less challenging weight so you can do 15-20 reps per set. All three of these work together for the best results.