I’m in my mid 40’s and my wife and I just started going to the gym last October. In January I saw a similar video challenge to do a 100 pushups a day for 100 days. The first day I asked the trainer at my gym and he just kept having me do small sets of 4-6 pushups until I hit 100 varying it up with some squats and triceps exercises. I was fairly shocked that I was able to hit 100 on the first day, and even more shocked that I got there in about 30 minutes.
The first 10 days were bad, I was really sore. Now that I’m on day 39 it doesn’t seem like it’s that big of a deal. I can now usually do 50 pushups my first set and I’m consistently doing more then 100 now because 100 doesn’t feel like that many anymore.
The big thing was that it only took 15 days to hit “OMG, I can see my triceps” and the past 10 days or so have been “OMG I think I can see my pecs”, admittedly I still have a bit of moob action going on.
I am surprised at how quickly it got “easy.” So I have been starting to add squats in, I did 50 yesterday and today seems like a good a day as any to make sure I hit 100. Once that starts feeling easy I’ll probably start adding sit-ups. We are still going to the gym 4 times a week, but man do you start seeing the results quickly with body weight exercises.