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It's not a ton, but beach lifeguarding here is a little over 17 US / hour and I think pool lifeguarding is usually like 10-15. Beach is only summer ofc and that's super hard to get into but a couple of my friends made it into pools.
Hey man, I just tried this new ab exercise today. It's called the spiderman plank and even though it almost killed me, it's really good as it works both your upper and lower abs as well as your obliques. Hope I helped! And how is your lifeguard thing going ? I'd love to hear about it :)