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A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, sand or rock dust. The earliest crushers were hand-held stones, where the weight of the stone provided a boost to muscle power, used against a stone anvil. Querns and mortars are types of these crushing 

A jaw crusher is a compression type crusher, comprised of a fixed jaw and moving jaw positioned in a V. The movable jaw compresses material against the fixed jaw, crushing the material to the desired size. An impact jaw crusher is a machine that uses striking as opposed to pressure to reduce the siz

You can get an effective aerobic workout with both an elliptical machine and a treadmill. However, elliptical machines might offer some advantages over treadmills. For example: Using an elliptical machine can be less stressful on your knees, hips and back than is running on a treadmill.

A typical 150-minute weekly goal is accomplished with 30 minutes a day on five different days.

Extension is when you increase the angle between two bones. Straightening your arms during your elliptical workout works strengthens the triceps -- the muscles on the back of your upper arms. You also work your shoulder, chest and back muscles in the upper body, and glutes, quadriceps and hamstrings in the lower body.