When I got this Massage Gun, charged it and put it under my bed. A couple of days later hubby was complaining his shoulders hurt. So I pulled out this wonderful machine and started working on his shoulders and back. It took awhile to get the feel of how it should be used, and what heads that where for what parts of the back. But now its something he really enjoys. The gun is a little heavy, but thats okay as long as hubby feels better. I was very surprized how long the charges last. The different speeds make it nice for shoulders, hips or even knees.