You don’t need a gym membership or a rack of heavy weights to tighten your butt. As a matter of fact you can squat and deadlift heavy weight and still not get the butt tightening results that you are seeking. You may find that your legs are shaping up nicely and your butt is lagging behind (pun intended).
The secret to effectively tightening the muscles in your butt is to supplement your traditional lower body exercises like squats, deadlifts, and lunges with challenging isolation exercises. While isolation exercises may not include heavy weight, they eliminate (or greatly reduce) the involvement of the quads and hamstrings. Those muscles may be taking over in the compound exercises and preventing you from getting the butt tightening results that you may have expected. By including exercises that rely entirely on the muscles in the butt, you are ensuring that they get the challenge that they need to get tighter.