You may have wondered why lifiting weights causes you to build muscle. Well like any other tissue of the body when damaged it heals, and not only heals but heals to a higher level then befor the damage.
Take your skin for example you fall, you cut your self, after a few days it heals. If you examine the healed skin it will usually apeare slightly higher, as it contains more layers of cells then previously.
As you lift weights, primarally high weight, the stress produces micro tares in the muscle tissue. These tairs are so small that you should not feel extensive pain after your workout or you may have worked out to hard. Give your body a few days and it will repair and build new muscle and therefor with time your muscles will increase in size.
This is why its important that you do not overtrain, and do not work a muscle in consecutive days. You must allow your muscles time to repair. It is recommended that you work different muscle groups from day to day.
