I've been wondering about this too.
I have noticed practicing the same 4 or 5 pieces for 2 hrs a day I am developing some rub spots on the under part of my right arm.
(Back side of forearm).
I have seen the pads like the Abel Armrest and the Pearse Sleeve and the Sleeves and Wristies that SBM has.
Anyone use these?
I am pretty sure if my feverous pace of 2hrs a day was lessened it wouldn't be an issue, but the wedding is 5 weeks out.
I am currently just wearing a soft cotton long sleeve shirt when I practice.
Coffee Roasting is like classical guitar, part technique, part art.
Without both the end result works, but never reaches what it could be.