r/cardio

I've been on a bit of a "get my shit together" fitness journey since I've entered my 30s.

HIIT used to be my white whale, but in the past 6 months I've made it a priority to get my VO2 up. About 6 months ago, I started doing Norwegian 4x4s twice per week, sometimes alternating the Seiler 4x8.

The first month or two was brutal, but now after month 6, I can spend 20+ minutes in Zone 5 and it's basically become an endorphin rush that I enjoy.

My question is: where do I go from here? I can't imagine I just keep spamming 4x4s and 4x8s, right?

What's my next adjustment to keep getting to Elite VO2?

I'm pretty skinny, mostly due to my poor appetite and I also just have fast metabolism I think. I want to do a cardio routine for my health, but I'm scared of losing weight. I've already been underweight a few times before and it's not something I like. Is there anything I can do to prevent weight loss while keeping up a cardio routine? Eating more is difficult for me as I get full quickly.

I’m using the omnicalculator from google and based on my weight and height of 57 kg and 168 cm, it says 10,000 steps on a pace of 2/3 mph (which I do daily) burns about 200-300 calories. I’m quite skeptical but do you guys think this is accurate? Added context I get my steps on rest days from doing incline threadmill for an hour with on 10 incline and 2.5 speed, or on a busy day I get my steps from walking around at my job which usually adds up to 10k steps at the end of the day

I know the lore of a concept 2 rower, but I don't have the space for one to fit, and I don't want to disrupt family when working out.

I've been looking at a merach and yosada magnetic rowers. Does anyone have any experience with these or magnetic rowers in general?

I'm trying to squeeze in some cardio daily before everyone gets up in the morning.