At this stage, it is only you who will notice there is a change in your body because of how easily and quickly you finish your daily activities. The 37th day of push-ups is not enough to develop your body for another person to notice it. If you are consistent enough and do the push-ups for three months, your body will start developing, and another person will see the physical change in your body.
I get your point. But experts say that 30 days of consecutive work out ( push ups in context here)is enough to cause obvious changes in your body, enough that any one would notice, although standard time for changes in the body due to work out is 2 weeks. It doesn't have to take three months to start 'developing', for example, it doesn't take three months for someone trying to loose weight to start cutting down... Take it from me, I work out a lot, and I've spent my life around that kind of environment. These are muscles were talking about, they expand and contract. Push up does this: stretches your muscles to a point it doesn't revert to it's original size, and that doesn't take three months of consecutive routine to start happening. Infact , somebody who's done 100 push ups for 3 months, that's about 9000 push ups, will definitely not "start developing" if you know what I mean.