Why are two count push ups harder than single count push ups?
by 
Little Miss Dangerous
ANSWERS: 3
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You're counting another stroke or motion, so you then have to concentrate on more motions as opposed to just one full motion.
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I always wondered why myself when I was younger! Doing two count (or four count) pushups is likely more difficult because the muscles must exert more effort over a longer time and thus expend more energy to complete a pushup than you would in a quick down-and-up. In physics, work is force applied over distance. So from that perspective, the same amount of energy is expended to cover the same distance no matter how fast or slow you do it. However, this does not take into account that your body is a BIOLOGICAL machine, which requires constant energy output to move and support your body mass, no matter what it is doing. So, for example, even though your body is not moving during the time where you pause between movements, it is STILL expending a lot of energy through your muscles in order to support it in that position. Which explains why, while I was in the Navy, the "rest" position was in the full up position during pushups: It required more energy to hold that position and thus hurt more!
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Fact from fiction, truth from diction. Less work.With single count push ups you get the weight/load up, then you are on the way down. You don't break the momentum so to speak. The same as if you did push ups slow you have to use more muscle to lower yourself then just breaking gravity. One would think running downhill is easier than running up hill but running down hill you have to use more muscle to stay in control, so it is actually harder than just trying to move uphill.
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