I know that it's normal and I would never put an expensive knit in the wash. Just wanted to give a heads up cause the washing instructions on mine state "machine washable in wool program", and doing this will turn your cardigan in wool under armour.
Got the first one from last season in gray, their wool stuff shrinks a lot after a wash. Mine became unwearable because the sleeves got too tight, I'd recommend to size up/have it fit loose before the wash.
I have got no idea about track, but having a solid bench (or upper body strength in general) definitely helps with basketball. The carryover isn't as obvious as it is with a football lineman, but there is a healthy dose of pushing involved in basketball.