Check out PushX3 write-up on Gadgetify titled, “PushX3: Push Up Device To Push Your Body”: http://www.gadgetify.com/pushx3-push-up/
Here’s an excerpt:
Everybody can do pushups. But not everyone does them the right way. Besides, you should always try modified push ups to keep your body on its toes. PushX3 can help. It is an innovative device that lets you target your upper body and core muscles using stability forces. The device is lightweight and portable, so you can take it with you everywhere you go.
The PushX3 push up device increases your range of motion and flexibility, allowing you to do push ups the proper way. You can incorporate PushX3 into your fitness routine to take it to a new level. Sets you back $30 at the time of this writing.