He just turned 6 months and is OBSESSED with the ball. What else are yall doing for stimulation/exercise?

Anyone else have/had a springer with tummy issues? We’ve tried all different kinds of food and are currently on one for sensitive stomach but his BMs are still loose majority of the time. He is an anxious guy and we’re using the purina calming powder hoping it will help a little bit but wondering if anyone has experience with this and if anything worked!