If you give a gift to a fitness enthusiast, the tallest thing is a sportswear:
If it's a couple's fitness, give him a couple's sports suit.
If your friend just likes to fight alone, give her (him) a set of sports equipment with good quality:
People who like fitness have always been simple. There is not necessarily only one thing in a person's life. Some people like not only fitness, but also other things. If you want to know him, you must observe him. Giving gifts is a technical job. You should know what she (he) needs. You should also communicate well.
It is also a good choice to send something to people who do hot sports, whether men or women, a beautiful and practical yoga blanket!
If you really want to give your friend a sports product, buy a brand. I think your friend must be very happy to give such a good set of equipment to your friend!