The chin splint may be cause the walk and the run at the softball field...not the squats. I have them every time we go for a jog...and believed or not the walk is also hard on your knees. We have a lot of people in the Army that can't walk or run due to long years of abuse...(ruck march, run every other day, etc). Try to stretch before and after any activity and change your tennis shoes. That may work. I buy running shoes (clearance) every 2 month just to have enough bounce and support on my feet. Also when you buy shoes, match your foot arch with the shoe. (flat feet, medium arch, etc)
600/400/500 @198 WT class (40-44)
Only those who risk going too far can possibly find out how far they can go!!!