This is actually the area I focus the most, there's been an amazing improvement on my biceps, as well as my pectorals and i couldn't be any happier about it.
I've been quite reluctant about hitting the gym due to my busy schedule, so I haven't had the opportunity to work on my biceps and pectorals which are very important to me, but this challenge has actually helped me to achieve that without even leaving my home and that's really cool.

Doing these push ups has now become part of my daily routine and I even added them to my schedule just so I won't have to miss any session.

To make the whole thing a lot more interesting, I took a picture of my biceps and pectorals when I started the challenge, and I'll also take another picture of em after the challenge so everyone could see just how much this challenge has helped in developing them.
Asides supporting bitcoin to hit 100k, this is actually another thing I've benefited from this challenge.