I'm 24 (soon to be 25) years old, am cca 184 cm tall and weigh cca 100 kg. I never did sports in my life, but recently got fed up with being overweight and in bad shape in general, and five weeks ago I started attending this functional training at a gym (90 minutes on tuesday and thursdays) - and so far it's been pretty good. I already feel a slight improvement in my endurance, strength and balance. OTOH, I'm also interested in martial arts, and have been considering starting training one of them. The same gym offers boxing, MT; BJJ, kenpo, wrestling and taekwondo - now, as wrestling and boxing trainings are held on mondays, wednesdays and fridays, for now I'm mostly interested in these two arts - boxing being the more attractive one. However, I'm concerned about the possibility of training 5 days in a row being too much and possibly causing certain health issues; I've also seen advice that a beginner should just pick a single art and just stick to it, and forget about training any other arts or sports; then there's also advice that one should train one art more frequently rather than combine two of them - which makes sense - however, most of the gyms don't seem to offer programmes with more than 3 trainings per week. So, my question is: do you think combining boxing and a functional training and training 5 days in a row that way is a good idea - or should I just stick to the functional training for now and possibly add boxing once I get in better shape?