Welcome!
We've all got our own little ways of writing out what we've done. Find a way that works best for you--something that you'll understand/reconginze when you come back to you logs to track your progress or just figure out where to start with your next workout.
Anything done on the ball takes a bit of concentration and practice. I've been using a ball for years now (I even sit on one at work instead of a regular chair), but I still fall off every now and then when doing a crunch or jackknife. They're tough! Hang in there.
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