Who says you don't need arms to bike? Actually, no one says that. But the sport of bike boxing is just getting started.
During the Dubai tour, rider Andrey Grivko was disqualified after he punched fellow-rider Marcel Kittle in the head in the middle of the race. That's one way to get this done. Or you could just ride a little faster.
As you can see from the picture, he cracked him wide open, but it didn't really help in the long run.
At first Marcel seemed rightfully peeved:
But then had a pretty good sense of humor about it. What a guy.