You will ask such a question, so you'd better not buy it either. Learn relevant fitness knowledge before making a decision. You must buy it. Or a treadmill.

If I want to recommend it, I must first buy a set of dumbbells and then prepare a yoga mat.

Originally, the treadmill is a relatively basic training equipment with wide applicability and simple use. Even if the goal is unclear, it is ok to have one. Training on a treadmill is generally doing aerobic exercise, which is a relatively basic training. No matter what your goal is, you need it.

Buy a sandbag to practice boxing, then this is a joke. Boxing training is a comprehensive and complicated sport, and punching sandbags is only one of the links. Especially the training skills, it is impossible to master skillfully without on-site guidance. Let's just say punching sandbags. It's easy to get hurt if you don't master the technology well.