Try to also focus on using different muscle groups for your push ups. Visualize what muscles you are using when you push, and work on different hand placements to use the different muscles. I also do some pushups where I rotate my elbows when I push up, and it feels more like a mid back shrug pulling me up, instead of my arms pushing me up. Little secrets like that really help with extending your maximum amount of push ups. Also, get the Perfect Pushup bars, they really do work wonders for push ups...
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