I don't think what your boyfriend needs most is material. He needs your support and encouragement in his heart.

Maybe you are busy at ordinary times, maybe you don't have time to exercise with him at ordinary times, but if you take time out of your busy schedule to exercise with him, you can help him wipe the sweat from his forehead when he is extremely tired, and show concern and consideration when his muscles are occasionally strained. Fully affirming his progress in fitness these days is what he wants most. Paying more attention to him and telling him to eat reasonably is what he wants most.

I am also a fitness enthusiast. I hope my answer is helpful to you.