Is this a good workout for me

I am going to be 15 really soon and I have started a small workout at home.
This is my workout
10 military push ups
20 sit ups
10 military push ups
30 sit ups
10 military push ups
40 sit ups
x military push ups till failure
push ups legs on a char till failure
This is all with no rest. I would like to become stronger as I know it will help me perform better in my sports. Do you have any suggestions to improve this workout, I have no weights or anything like that available.
Thanks for your help
 
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