: Got a little crazy today! Felt like doing Eccentric Upper from #P90X3, when I was supposed to do Bulk Arms. I think I blew out my esophagus from doing this. Anyway, check out this move from it! ECCENTRIC PLYO PUSH UPS. Oh em gee. Not only are you jumping in the air from push up position, you have to do it in a three count up and down! Hellish. Effective. Nauseating. But I love it.