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enough, yes . . .
it is called resistance training, ie you should push yourself to move the weight. are you a beginner? try a weight you can - just about - do 6-8 reps with and start training your legs 2-3 times a week. 100+ reps is just another form of cardio.
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'It is an unnatural business to find yourself in a strange place with an underutilized brain and no particular reason for being there, and eventually it makes you go a little crazy.'
- Bill Bryson
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