No matter what your age or what your exercise history, there are several principles that apply to every single person who wants to pursue physical fitness. Make sure to follow this fitness advice to ensure your safety and endurance.
Keep it light and do it right
Whether you're lifting weights or running a mile, make sure you take precautions to keep proper form. Make sure you never lift weights so heavy that they cause you to lose proper form, and never run further or faster than you can maintaining correct form. It's better to work out longer at a slower pace or lift extra repetitions at a lower weight than to push yourself too far and injure yourself.
Less is more
Pace yourself such that you don't burn out on exercise. Vary your type of fitness training such that you do a couple days of strength training every week and some sort of cardio exercise five days a week. Make sure you exercise just enough to challenge yourself, but not so much that you are terribly sore or too miserable to exercise again the next day.
Make sure you're having fun
Establish a fitness training routine that you truly enjoy. If you aren't having fun, you won't stick with your training program. Experiment with ways to exercise until you find sports or activities you find enjoyable enough to do repeatedly.
Develop a routine
Make your exercise program a routine. Meet a friend every Saturday morning to swim or make a fitness class part of your weekly schedule. Bookend your days with a short walk in the morning and a short walk after dinner. Find ways to make fitness training a part of your weekly schedule so you don't have to figure out when you're going to exercise spur of the moment when you're likely to cancel.
Protect yourself from injury by stretching both before and after exercise. You need to hold stretches for a minimum of thirty seconds per stretch in order to lengthen the muscle enough to make a difference. Stretch just enough to feel the stretch, but never so much that the stretch hurts. Release the pose after your thirty second stretch, repeat the stretch on the corresponding body part, and then repeat the stretch again. Every time you stretch, you help your body increase flexibility and resist injury.