Any stretching you do a part of our fitness training should not be bouncy -- it should instead be slow and continuous. It's recommended that you stretch only after a warm-up or workout, since the temperature of the muscle fibers is highest then and you can stretch them easier.

You should always be sure you drink plenty of water during all phases of your fitness training. As little as 3% dehydration can negatively affect your strength by up to 10%, and it only goes up from there. Be sure to hydrate yourself before and after your workouts at the very least.

If resistance training is part of your fitness training program, be sure to exhales as you lift a weight and inhale as you lower it. Never hold your breath while weight training! This can raise your blood pressure to dangerous levels, and can even be deadly.