You have definitely come to the right place for success! The resources on this awesome FREE site will keep you informed, give you the chance to join teams accept challenges, make friends (lasting friends who really care about you, online and off). Be diligent: track everything, stay involved in this loving community. May God bless your success on this journey we all share.
I wish I could help you regarding calories burned, but I don't know how to calculate because there is so much time between "pitches" - it is not an ongoing motion you could call a "set" of 12-15 reps. My suggestion would be to consider it a wonderful "extra" that will keep you in great shape for your regular, more structured workouts, and may even compensate just a tiny bit for the rare, very rare, day when you don't manage to work out.... At any rate, you're way ahead of those of us who only exercise our fingers on the keyboard for hours at a time. (I do Coach Nichole's 15 minute office workout video several times a day.)
You'll love it here. I can tell you have a great attitude. I hope you'll add me as a friend and ask any time I may be able to be helpful.