Strength training is effective only to the extent that you are genuinely challenging your muscles at close to their maximum capacity. This is generally taken to mean fatiguing (ie. you feel you cannot do another rep with the correct form) in 15 reps or less. If you can do more than 15 reps, it is just not challenging enough to be effective strength training. If you can do something for 5 minutes (much less 20), it is definitely not ST, it is cardio. The 'strength training' setting on the elliptical is highly misleading.
Higher resistance cardio workouts do build endurance in the muscle, and of course they are a much better cardio workout than just cruising along with a low resistance setting on the elliptical. But it is no substitute for genuine strength training.
Don't stop with the high resistance setting on the elliptical, but do add some genuine ST as well (eg. squats).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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