If you have no strength, you need to exercise. With such motivation, you are half successful! There is no shortcut to strength improvement. You can start with push-ups, six groups a day, and each group is tired, that is, do a few push-ups and rest for 30 seconds between groups. You can also start with low-difficulty push-ups, such as putting your hand on the edge of the table to reduce the difficulty and gradually increase the difficulty. Hang in there, it will take 4-6 weeks to get the results. If you do push-ups, you can do 10 push-ups between groups.

I hope this helps.