Boxing - really shouldn't take it up at 52 yrs old, even training.  I had decided that it didn't make sense for me to just sit on my backside whilst Joey worked out so asked Ahmed if I could basically 'shadow' what they did.  As it happens, they have a dad and son rate and I was able to do it.  He pushed me hard enough that it hurt, but not too hard and I will be back next week.  I'll have a six-pack and bulging biceps yet.