I do a little engine work for other people , and it`s just a habit for me to run one on the stand before giving them their engine. Gives me a chance to warm the engine up, re-torqe the bolts , check for air leaks, set the carb , have a barley pop, ect .

I have no problem running one in a plane if it`s a new or a previous run engine , but the ones that are iffy , those get a run or 2 on the stand first .
And since I had back surgery , working off a stand , bets bending over .