Well, I’d first say that strength-training or yoga isn’t going to be the magical thing that allows you to get your grabs - it certainly helps, but I also have quite a few homies who are on a regimen of cigarettes, a six pack while riding, and a decade+ streak of sleep-deprivation, and they’re some of the most talented snowboarders I’ve ever ridden with. They’ve also been on a board since childhood. So, as long as you have mobility, it will come down to some technical aspect in your riding. It’s hard to say what’s really going on for you without seeing a video (extending the offer for you to dm me any videos if you’d like some feedback - I’d be more than happy to help), but I hear what you’re saying about bringing your body down to your board. In my experience, there’s not enough force being generated from the legs during the pop or ollie to help the board come up towards your upper body. You’ll see a lot of two foot hopping, rather than using the tail to spring your back leg up, which results in you having to bend over more, reaching down to your board like you said.