I do Boxer and Close Arms all the time! I do all my wall pushups in the shower. I even put my arms about waste high, fingers pointing down, on the wall and do them that way. it's a totally different workout for your arms than ANY other pushup around. I don't know why they don't have them listed on the site.
And off topic, but a great idea, I also do calf raises in the shower. Use the wall for support if you need to, and point your toes away from the drain so it's more of a stretch for the whole bottom half of your leg when you go all the way down on your heal.
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