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Grantmac said..
MTB is great but as mentioned very likely to cause injury.
Hmmm, not sure I fully agree.
It really depends on how heavily you want to push your boundaries.
I consistently ride at about 80% as a max (because I'm a fair bit of a chicken) and have had 3 minor accidents (with a bit of bark off on 1 of those crashes) in the last decade. Friends who are way more talented than me are going to their limits and having big ones that take them out for 3 months +.
If you're not super competitive and enjoy motoring along with some redundancy, then mountain biking is a great way to keep fit.