Klonopin, magnesium, calcium help my tight muscles. PT helps. Can't get in the tub because I live alone and it wouldn't be safe, so I use a shower. The warm water in the shower is as good as the tub, anyway. I haven't gotten around to Epsom salts because it would involve putting down a pan, picking it up, and I can't pick it up without spilling it.
So the magnesium I take by mouth helps, probably similarly to Epson salts' magnesium.
This helps for myoclonus too (jerking of legs, spasticity).