In Engpsh, the legs are usually referred to as "legs." You can use this term to refer to both singular and plural legs. For example, you can say "I have two legs" or "She has long, slender legs."
If you want to be more specific, you can also use other terms to refer to different parts of the leg. For example, the lower part of the leg between the ankle and knee is called the calf, and the upper part of the leg between the hip and knee is called the thigh. You can use these terms to describe the legs in more detail.
For example, you could say "I have muscular calves from running" or "She has toned thighs from doing squats."
I hope this helps! Let me know if you have any other questions.