It's not fun, but doable... my arm could just reach with the floorboards removed. Heat the hose to get it on the barb. Prepare for boat yoga! It might be possible to release the elbow from the shower pan, remove the drain grate to check. Replace with the best hose possible (usually 10 or 15 yr warranty).
All the sink drains are probably due / overdue as well..... how's the exhaust hose?that's usually the first to go.
I don't trust those glued on cuffs.