Besides the hammer, Channel Locks are by far the best tool ever invented.I know what you mean. Just turned 63 and got the arthritis in both hands. Always stiff and sore. My hand strength has significantly decreased in the last couple of years. I keep a channel lock in my kitchen drawer to crack the seal on the vodka and tonic water bottles.
Ya just do what ya gotta do!!!
Hell, as a retired Plumber, I use Channel Locks as a hammer at times.