Happy birthday! Wow 52 sprawls. That body combat exercise class will definitely help you in this black belt challenge. That’s awesome you teach what you love to do. It is great that you teach modified versions so anyone at different ages and fitness levels can join in. The year of the tiger is a fantastic year!

The first month is one of the most difficult months. The body takes some time to adapt to all the new physical exercises you are doing. I tried to do a little bit every day. For example, It does take time to build up to the amount of pushups and sit ups needed to be done to complete the challenge. I started with 40 and increased a little more each week until I reached the amount that was enough to complete the challenge. Look are your numbers from the first month a feel that sense of accomplishment.
I know your sit up numbers are not correct. Maybe sensei can fix it.