Each time a weight is lifted, the muscle that is receiving the primary stress actually breaks down. Little pieces of the tissue are broken off, then slowly rebuilt by the body. When they are rebuilt, the muscle increases in size, and a greater muscle mass is achieved. A muscle needs about forty-eight hours to recover completely before being broken down again, so it is not wise to excersize the same muscle groups on consecutive days. There are two types of weight sets that a person can use.
Nautilus equipment is a machine that uses a system of pulleys and bars.
Free weights are simply a bench and a bar, with plates of weight that can be added. While free weights often work more that one muscle group at a time, a nautilus machine will isolate a specific muscle. A nautilus chest machine will take the stress off of the deltoids and triceps, and place maximum stress on the pectorals. When a person thinks of weightlifting, a massive, muscled up body builder always comes to mind. One of the first men we think of is Arnold Schwarzenegger.