Let’s talk about the most important thing you’ll ever put in your mouth (besides a post-dive taco ). Your regulator is literally your "life support system" underwater. If yours is breathing like a clogged straw or making you work for every lungful of air, it’s time for an intervention. Regs are engineered to deliver air so smoothly and effortlessly that you’ll forget you’re even underwater. Just breathe and relax—we’ve got the technical stuff covered. 

Warning: Using a high-performance regulator may lead to significantly lower air consumption, a Zen-like state of underwater calm, and a complete refusal to ever use a crusty rental reg again.