It's so Bam, isn't it? He can't just quit booze and take it easy, it has to be 5am 5km hikes with a pretend witchdoctor. How old is Bam now and he can't even stop obeying his elbow without making it someone else's responsibility. Just stop drinking, you moron.
The bit where he says the Shaman will make Bam "look like a Greek God in a month" - that's just Bam's way of making his own health someone else's job, and a way of deflecting blame when it all goes to hell again.
I think it would be better for everyone, including his own son, if Bam dies.