How do you get strong without weights?

Answer 1

It is possible to improve your strength without weight training, but it is not possible to do it without resistance training. For example, by pressing hard against various objects (including yourself as in Charles Atlas's "dynamic tension" old course), you can improve your strength. The best way to do it, however, is by progressively lifting heavier and heavier weights.

Answer 2

One must remember that bodybuilding is a marathon and not a sprint. It takes time and effort to gain qaulity muscle. Other than lifting, your eating and resting habits are very important. You need to make sure you are getting enough protein in your diet. Most people 1 - 1.5 grams of protein per lb of body weight. Also, make sure you get plenty of rest and sleep. This will help your msucles repair themselves. You can hinder your gains by overtraining.