Although I am in (mostly) good physical shape, I found it beyond creepy and refused to do it. But I worry about them increasing the discount in the future. It'll be harder to say no when it's $1000, or $2000. And let's be real: it's not a discount, it's a penalty for when you don't do what you're told.
And given how my insurance doesn't even cover a 30-minute ER visit without sending me a bill in the mail for $1700, it's hardly even worth having insurance at all. At least at my age.