Some stupid pet-trick training options for ice climbing:
Go hiking and carry an ice ax in your hand--all day. Maybe your hiking partners and other people on the trail would prefer you carried a 2lb dumbbell instead of a weapon. Seems silly, but lots of ice climbing is just holding on to your ice ax all day.
On said hike, when you find dead and downed trees, pause from hiking, identify tiny spots on the dead tree to drive an ice ax into, drive said ice ax into the tiny spot. Grunt ninja attack vowels with every strike. Compare the intended spot to the actual spot. Also vocalize ninja attack consonants as you struggle to pull the ice ax out of the wood, which will abuse some muscles and joints that you probably don't use very often. Repeat until intended and actual are the same; then repeat with a bigger swing from the shoulder. Your hiking partners will have a new respect for you, and other people on the trail will give you a wide berth and hike away hastily. To maintain this training regimen, you may need to hike alone. If you want to maintain the good graces of your hiking partners, maybe you could spend some time with a hammer, scrap wood, and nails in private somewhere. Ability to swing and aim an ice ax all day can be handy.
Torture your calves. Ice climbing is just standing on your tippy-toes all day.
Make sure the rest of your life is a dumpster fire of epic proportions. That way when you're ice climbing you'll be able to tell yourself honestly that things are so much better ice climbing than they would be if you'd just stayed home.