Performing push ups is one way to strengthen your body. Not everyone does them properly though. The ARC-NRG Push Up Machine is an interesting tool that lets you choose the amount of resistance while engaging your entire body. With ARC-NRG sliders, you can perform a bunch of different exercises to push your body.
The ARC-NRG PushUp simply helps you work on increasing your core and upper body strength. Not super cheap though.