Side pull halp

Hello Team, I am new here. I was out bouldering with my niece and nephews this weekend. I haven't climbed much since I had kids and never liked bouldering too much but did find this activity enjoyable and would like to start climbing again as a fitness regimen. I noticed that my side pull game was off. I weight train, but those side pull muscles aren't used by civilians all that much. Does anyone have a recommendation of how I could improve my side pull strength using weight training? Thank you muchly.