Hello, landlord, I used to practice my legs for playing ball, and my legs became very thick at last. My mother taught me a stovepipe method: lie flat, bend your left leg to support your body, and lift your right leg straight, making an angle of nearly 90 degrees with the bed or the ground. At this time, your right leg should be straight. Hold the right calf with both hands for more than ten seconds, and continue with the left leg. This action is very simple. You can do it in bed or on the floor. My mother learned it when she was practicing yoga. There is another simple way: when walking and going up the stairs, lift your heels, walk on tiptoe and keep your legs straight. This method is taught by the coach of our school basketball team, which can not only increase leg strength, but also won't grow excess meat. I hope it helps you.