Correlation between exercise mountain bike amd gimn vs general health benefits is scientifily supported? Benefits of movement? Work eight hours sitted..

Yes. There is a plethora of literature that supports that movement and exercise promote better health. There are many people that have sedentary jobs. That can be combated by getting up several times an hour to move around and with what you do in your time off. Mountain biking is excellent exercise so keep doing that. Good luck.