You are very much welcome believe me you are in the right track you won't regret participating in this 100 push-up challenge a day until Bitcoin is $100k because it has also helped me in areas of health benefits all you need to do is to be consistent the benefits don't just come so fast for is a gradual process, and to honest with you there are pains attached in achieving this no good thing really comes so easy, concerning your fat stature you don't only need to rely on push-up exercise you also need to add some other cardio exercises such as running, squat jump, stair climbing, lunges exercises it can be running lunges or walking lunges etc, which will really help burn down some fat in your body but you need to bear the pains to achieve the gain, when exercising this word should be ringing in your mind NO PAIN NO GAIN.
Also note that exercise don't add height if it does we won't be seeing short people around. Ones again welcome to this challenge is not a do or die affair.