Without guidance, it is likely that long-term fitness will cause some intangible injuries, such as obvious chest tightness, chest pain, joint achilles tendon problems and so on.

Of course, this is also a small part. See if you can completely follow the action of the fitness APP. Laziness is bound to go wrong.

In the gym, not necessarily good. At least people with the same hobbies can communicate, and some coaches will not refuse to answer some fitness questions because they don't buy private lessons. And a good coach has a keen eye, can point out your problems to the point, and take fewer detours.

Either way, it will take some time to verify. Fitness generally has experience classes and cards. You can try it or ask the coach questions. People who go for the first time are generally more enthusiastic.