You exercise badly ... - only "once in a while" - maybe you do exercises badly (I don't see you) - you probably "switch" - it is appropriate to supplement sugars for exercise You can eliminate difficulties if you exercise more regularly, probably less, you will learn correct technique (visit fitko, the trainer will show you the correct execution of exercises). Warm-up (muscles warm up and stretched) and “warm-up” (at least part of the lactic acid, which causes the pain), and subsequent relaxation (such as a warm bath or sauna) also contribute to proper exercise.