I want to certify for level 1. I've been thinking I need to build endurance and perhaps work on a few things like workouts or strength training before I go. Any recommendations?

Also, as it's winter I'm thinking it's best to wait a few months until it's warmer. Do we agree on this?

And I feel like springs are best for this vs the ocean?

Idk if there's any pool deep enough for this. I believe it's all in open water.

Aside from that I have a fear of depth but I like facing my fears and I've wanted to do this for a long time.

I also don't know if anyone is familiar with this: when I try holding my breath for a lot of time, I feel like I lock it kinda like if you've ever use the smitch machine and notice how the latch locks, it's kinda like that. And my thought is that I'm not supposed to lock it like that when I hold my breath bc it makes it harder but also if I don't it feels like the air will go. I know freediver will cover that but just wanted to bring it up as I've been wondering and perhaps I can practice.