Could balance exercises be BAD for you?

Whoops, that's agonistic. Haha, my bad.

Interesting thought. You're running far more than you are doing balancing drills, so your body will not learn those muscular interactions over the running ones. It pretty much just strengthens those muscles and makes them ready for proper response when you fall off-balance.

Look at the research, it backs this idea up.

Balance/stability training is a bunch of crap.

It leads to co-contraction being trained...not to mention it leads to less muscle activation than if doing the exercise normally.

It's potentially bad for you to the degree that it's conducive to injury. My complaint against "balance" training is that it is simply irrational, unproductive nonsense and a distraction from the real essence of exercise, which is hard muscular work.