As others have said:
Nursing isn't bad if you can take it (not for everyone, plus you'll have to spend a few years in a sucky place to get experience unless you have good connections)
IT/Tech is the easy way, just need an employer that's flexible. Again - likely have to put in a few years to be trusted (though that will likely change by the time he's in the workforce)
Desk jobs are great if you're a mountain person, as risking your livelihood on every jump isn't very comforting (I can't imagine doing electrician/plumbing work while rehabbing an ACL is any fun)