pumps for bad backs
If you've got a bad back, get a foot pump. I got one (from Cascade, I think) a few years ago that's really big, with plywood shells and raft fabric bellows, that's really quick. It inflates a cat tube faster than an electric LVM (and you don't have to endure the vicious whine). Bad news: no brand name on it, not in their current catalog.
For inflating smaller boats and top-off on the river, I use a Bravo 2 foot pump (NRS, $30) that I've had since 1995. The bellows fabric wore out, so I took it apart and put a patch on the inside. It's more compact than the Wonder Pumps (had oneľ rough on the lower back) or other barrel types, and the hose is much more durable.
Give it a goľ I think you'll be happy.