Safety First
To do most of the strength exercises you need to lift or push weights, and you need to keep gradually increasing the amount of weight you use. You can use the hand and ankle weights, or you can use things like emptied milk jugs filled with sand or water, or socks filled with beans and tied shut at the ends.
There are many alternatives to the exercises for example, you can buy a resistance band (it looks like a giant rubber band, and stretching it helps build muscle) about $10 to do other types of strength exercises. Or you can use the special strength-training equipment at a fitness center.
Safety
Don't hold your breath during strength exercises. Breathe normally. Holding your breath while straining can cause changes in blood pressure. This is especially true for people with cardiovascular disease.
Avoid jerking or thrusting weights into position. That can cause injuries. Use smooth, steady movements.
Avoid “locking” the joints in your arms and legs in a tightly straightened position. (A tip on how to straighten your knees: Tighten you thigh muscles. This will lift your kneecaps and protect them.)
How Much, How Often
Do strength exercises for all of your major muscle groups at least twice a week. Don't do strength exercises of the same muscle group on any 2 days in a row.
Depending on your condition, you might need to start out using as little as 1 or 2 pounds of weight, or no weight at all. The tissues that bind the structures of your body together need to adapt to strength exercises.
Use a minimum of weight the first week, then gradually build up the weight. Starting out with weights that are too heavy can cause injuries.
At the same time, remember that you have to gradually add a challenging amount of weight in order to benefit from strength exercises. If you don't challenge your muscles, you won't benefit from strength exercises. (The "Progressing" section below will tell you how.)
When doing a strength exercise, do 8 to 15 repetitions in a row. Wait a minute, then do another set of 8 to 15 repetitions in a row of the same exercise. (Tip: While you are waiting, you might want to stretch the muscle you just worked or do a different strength exercise that uses a different set of muscles).
Take 3 seconds to lift or push a weight into place; hold the position for 1 second, and take another 3 seconds to lower the weight. Don't let the weight drop; lowering it slowly is very important.
It should feel somewhere between hard and very hard (15 to 17 on the Borg scale) for you to lift or push the weight. It should not feel very, very hard. If you can't lift or push a weight 8 times in a row, it's too heavy for you. Reduce the amount of weight. If you can lift a weight more than 15 times in a row, it's too light for you. Increase the amount of weight.
Stretch after strength exercises, when your muscles are warmed up. If you stretch before strength exercises, be sure to warm up your muscles first (through light walking and arm pumping, for example).
Progression
Gradually increasing the amount of weight you use is crucial for building strength.
When you are able to lift a weight between 8 to 15 times, you can increase the amount of weight you use at your next session.
Here is an example of how to progress gradually: Start out with a weight that you can lift only 8 times. Keep using that weight until you become strong enough to lift it 12 to 15 times. Add more weight so that, again, you can lift it only 8 times. Use this weight until you can lift it 12 to 15 times, then add more weight. Keep repeating.
