Hello.  Honestly, it wouldn't matter if this were a hobby or an extracurricular activity.  It is well documented with the court and the committee meeting minutes that the tables used to derive the parental child support obligations are inclusive of every conceivable expense for a family.  When a parent is "residential" or "custodial" they receive all the money for all these expenses and they are expected to pay for them using child support money.

It is a common misconception that a child should be able to be supported on child support.  This narrative is completely false.  Kansas is an income shares state which puts a financial obligation on each parent to pay their respective share of the expenses.  So the child support payment only represents the father's portion.  Mother also needs to contribute.

My personal opinion is that cheer is absolutely an extracurricular activity.  Terming it a "hobby" is tomato/tomoto.  Cheerleading is practiced in schools. Just because you decide to spend $1k or more per month for competitive cheer doesn't make it a hobby.  But, to my previous point - it doesn't matter what you call it.

While I sat on the advisory committee I was in the room when a similar question was asked of the state economist.  It was concluded that families who elect to spend enormous amounts on frivolous activities simply take away from other activities (and potentially needs).  This would be the case with married families - there's no reason to provide additional advantages to children of separated families.  If it can't be afforded in a married family, it can't be afforded by a separated family.

A little blunt, but that's my opinion.