First: adjust your schedule. On the one hand, no one will refuse. The dormitory is a public and private space. Use your habits to drive your roommate.
Second: If you can't change others, change yourself and plan your time well. He likes to exercise in the afternoon, so you should arrange your own time, and don't blindly hope that others will follow their own arrangements, which will only make things worse.
Third: If you are not satisfied with your figure, you can join in. After all, women like men with good figure, and men want their girlfriends to have vest lines.
Fourth: If you can't do the above three points, please buy a big subwoofer. He makes you unhappy, and you make the whole building unhappy.
Above ~ Please adopt.