I'll cop to being sensitive about the topic.
It's a topic that's come up at every gym I've ever trained at with every trainer I've ever worked with.
It's a battle I have to fight all the time; so I take comments like that personally.
Here's some info as an FYI for something that affects 3 out of every 1000 born:
Clubfoot - MayoClinic.com
Clubfoot: Symptoms - MayoClinic.com
Clubfoot: Complications - MayoClinic.com
Clubfoot: Treatments and drugs - MayoClinic.com
Club foot or not, there are plenty of fighters that don't run or don't run more than a couple times a week.
Jogging puts a ton of wear and tear on your joints and some people just aren't built for it.
Marciano may have run 10 miles on Christmas day in heavy boots, but he also retired early from a bad back.
Some people's bodies don't hold up well with the strain from jogging; so if this kid says he'll be laid up from running more than once a week - i tend to believe him. He'd probably be better off jumping rope, doing the elliptical crosstrainer, swimming, or riding a bike.