I was in decent shape before but it is definitely helping. I was originally doing 4 sets of 25 but that became too easy so I switched to 2 sets of 50. 50 in one set is still a challenge to complete the last few so I think it was a good change.

A few days ago I actually started a new experiment which is to do one set of 50 push ups the standard way and the second set as decline push ups (legs elevated on a chair) which forces you to move a bit more of your body weight.

I was thinking when we hit 100k I might change the goal to 150 a day and do 50 standard push ups, 50 incline push ups and 50 decline push ups to isolate different muscle groups.