text: WOW!! Good for you! You are going to be so much more healthy and buff! This is just a side stitch. It is extremely common and very normal.  Try to control your breathing from start to finish.  I had them especially as a young track athlete but less now that my mind is more on preventing exhaustion and conserving energy for endurance through thoughtful breathing. I hope you keep up the work. Your body is going to be banging! (That's good... ;-D)