You should exercise enough to work up a light sweat and raise your heart rate to your target training zone. Jerking while lifting weights. When you jerk the weight you are usually jerking other muscles too. This can lead to strain and injury with the muscles of the back being particularly vulnerable. Unless you are working out for longer than two hours per day you don't need to supplement your diet with high energy bars and drinks.
High energy is usually a code word for high calorie.
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