If it's thighs and calves

All you have to do is squat and leapfrog.

If it's the pectoral muscle and the muscles inside the upper arm

(Professional ranking What is biceps brachii or something? I forgot)

You just do push-ups and sit-ups

And a tensioner.

You don't have to buy anything here.

But when you do exercise, you should keep your balance and work hard.

Otherwise, it will cause you to be big and small when practicing.