Good idea. I used to practice all sorts of skills at the velodrome and I still try to focus on a skill every ride, whether it's cadence or pedalling action etc.
btw, I think it's good that your LBS requires a little bike time before fitting (although getting it in the ballpark first is good), but I wouldn't expect it to last the life of the bike. I know that a couple of stage-winning pros tweak their saddle height regularly so don't think you are stuck with it forever if it's not right. It changes with flexibility, injury, weight etc.
It's also a good idea after your fit to record all the measurements (you might even be able to get the shop to do it while you're there). Park Tools has a nice chart for this. So if a saddle slips or the bike is damaged or you change components, you have the data.




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