Yep definitely Enshin and the others mentioned cover that.
In terms of safety etc I would just say to always keep safety, longevity and sustainability in mind. I trained in Kyokushin for about 8 years, and it turned out to be not very good for me. My instructor was fantastic though and always looked out for us, but we did get pushed very very hard, which is a standard and hallmark within the style. I learned an incredible amount from that style of training, and realised so much about myself that I couldn't have gotten from alot of other training, and there is something really magic about the intensity and spirit of osu and perseverance. I also realised in the end that I had to leave that style of training behind and work on being much kinder to myself (yes, broken record am sure I've mentioned it far too many times here hehe).
Train smart and listen to your body at all times, but if something within you is really drawn to it I say go for it!
In hard styles which have alot of heavy contact and the need for alot of tension, to me it's best that you find some way to balance the training out with relaxation and flexibility/mobility work. Stuff that opens up the body from an incessantly contracted state (externally and internally

).