top rope belays, trad anchor belays, top belays, rapping down with one or more ropes - rock or ice. This is the only belay/rappel device I have ever needed, it does it all and it's light weight plus it's WAY more secure than a Munter for a top belay, it practically works like a grigri up top.

When you train to rock climb you should cycle through endurance and strength. This is designed for the endurance cycle.

Squeeze it and hold it for a long time, 10 or 20 minutes. You don’t want to squeeze it as tight as you can, just enough to keep it closed. Much like when you are on rock, you don’t grip the cliff as tight as you can, just tight enough to hang. This preserves energy and builds endurance so you can make it to the top without falling. If you wanna do multi-pitch climbing you don’t just need bouldering strength, you need to be able to grip for long periods of time.

If you are serious about climbing, you should be climbing and not using this. But as far as portable hand workout tools go, this is the best.

I tele a lot in the trees in Vermont. The season before I picked these up I broke 4 ski poles in half. These seem pretty tough, given I haven't smashed them into and birch trees flat on yet, they aren't even bent.
Also, they're extremely light weight. I always had the cheapest poles because I never wanted to drop cake on them but these were a good buy, I can feel the difference in my balance in a quick shift.
The size adjustment seems to stay in place just fine, I have to check each morning that they are pressed in tightly so they don't push up on me which isn't what I expected but its not too much of a nuisance.
The wrist straps - this is something I've never had before. Not sure what it was actually made for but its EXCELLENT for getting on and off of lifts. My gloves are big and bulky, so taking my hand in and out of the wrist loop is a non factor, I just unclick and release the grip and jam my poles under my leg for the ride. When I'm in the trees I do the same instead of unwristing in case of a crash, i just unhook the release so I don't get caught on anything. great feature.

I've used these gloves all over the globe now and I have never been happier with a glove. They have kept my finger tips warm in sub zero temperatures with 30 knot winds, which are temperatures I have never been able to keep warm hands in. They are genuine leather, which makes their grip good and strong so you really can get into your bag/gear without taking them off or letting any snow up your sleeve. Just remember to keep putting the leather guard on every time they get wet at all so they last forever, which they will.