Do you play bball regularly? There really is no better cardio if you're playing bball and going all out. Started playing ball in January after not touching a bball for 5+ years, what a gut punch. I'm not overweight or anything like that, I just didn't have the explosion I did when I was young, could barely go by people. Felt like I was in fucking neutral.
Eventually got in better bball shape and some of it started coming back. It's amazing how your skills deteriorate. I stopped playing about a month due to stomach issues, I was cramping way too easily, wasn't due to hydration. One point I thought it may be early sports hernia, but it wasn't. On some probiotics and been alright so far, though I haven't tried to play in a month.