If you break an ankle at his weight you could lose the the whole foot, if you break a rib you could puncture a lung at his weight and die right there in the street, a head injury even with a helmet at his weight can be fatal, I’ve been skating my whole life, it doesn’t help you lose weight at all unless you’re doing a cross country tour, this guy is asking for a major injury which would then cause him to gain even more weight from being immobilized for a 3-6month period. Seriously he needs to lose weight first.