Stossel says no such thing. You really ought to READ the article before posting.
Stossel has no issue whatsoever with limits and regulations - as long as it's the league or other self-regulating sports body making the regulations. People can make their own rules, and anyone wanting to participate will be obliged to follow them.
But the government does not need to insert itself into private conduct.
The greatest test that every politician faces is to stand up to the chorus of "we have to DO something". Most times, that's just a load of crap. What I love is a "do-nothing" Congress. Let's have more of those.
I did read the article. Among the points Stossel tries to make is whether taking steroids is any different than getting eye surgery. I was following that line of argument. My points had nothing to do with government infringing on private rights.