If you are weight training, trying to put on muscle and your body refuses to grow, take a minute to think about whether you are over-training it. If the answer is yes or even maybe, adjust your training and back off.
Good form will not only help to prevent injury, but will also increase the effectiveness of your workout.
While down time and sleeping may feel like lost time, if you're trying to build muscle, it's anything but. The body uses this time to recover, and ultimately to build.
Love weight training but not so fond of having to do cardio? Try doing just a couple quick minutes of intense cardio, like skipping or sprinting, between sets. Trust me it'll be over before you know it and you'll feel better because of it.
Whether you are trying to lose weight or gain it, trying to eat healthier or exercise more, tracking is extremely beneficial. Keep track of how much you've lost/gained/eaten/exercised, whatever it is that motivates you. This will also give you an idea of the habits and exercises that help you to or keep you from achieving your goals.
Having trouble sticking with your cardio routine? Pick an activity you enjoy doing. Playing basketball or swimming at increased intensity a couple times a week is just as beneficial as going for a jog.
When it comes to weightlifting and bodybuilding, keep in mind that the quality of the workout is much more important than the quantity of the workout. Be sure to concentrate on form and intensity, rather than how long you're at the gym.
When lifting weights remember that lowering the weights in a slow and controlled manner is just as important as the upward motion.
Your body is constantly adapting to your workout. Because of this, if you are doing the same amount of cardio at the same speed for more than a couple weeks your body will no longer burn the same amount of calories. To burn the most calories, continuously vary the speed and intensity of your cardio workout.
While going for a walk, try tuning into an audio book rather than listening to music. Especially if it's a suspenseful story you might catch yourself exercising longer and looking forward to your next walk, and the next chapter.