Chalk? I've never had an issue with a callous tearing getting in the way of a workout. Sometimes heavy deadlifts will cause them to rip but it's easy enough to work through. As you lift more they'll get stronger and more smooth, I know it doesn't make a lot of sense but my callouses are barely noticeable anymore, just a small rough patch rather than big nasty raised rough callouses. Some people have suggested filing them down and lots of lotion when you're not lifting to help soften them up a little making them less likely to tear. Just google "callus care crossfit" and you'll find tons of decent information.