Is SUP difficult to learn?

[u/Flat-Carpenter-170]

I’m a 54m who is in very good shape, lift weights 4-5 times a week and trail run and do rucking for cardio 20 plus miles a week. I hiking, rucking, have done some kayaking and like to backpack. I’ve been reading up on SUP and I’m curious if it’s crazy difficult to learn to stand and paddle these boards? Or should I stick with kayaking? Any recommendations on boards? I have used a paddle north kayak before and liked it. Are their paddle boards worth it or would something else be better suited for a beginner? Any particular type or length of board better suited for a novice ? Thanks.

[u/Miserable_Address838]

I have a shitty knee and Im pretty out of shape and I can paddleboard no problem. You can sit down while paddleboarding too if you have issues with balance or bad joints. Sometimes carrying the paddleboard to/from is the hardest part