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Sounds like you're panicking and tensing up, causing you to sink. Maybe try practice floating so you know you won't sink even if you don't even do anything.
I can front float pretty well because it is the way I get into my head underwater breaststroke variation but it is no use with the head above water or the water treading thing
You’re probably dropping your bottom. Relax, big slow movements. Swish with the hands like paddles, push down with the feet but not too much, you don’t want to go up and down.
Wdym dropping my bottom? I thought treading water is about standing straight?
Try doing your breaststroke kick downwards while holding onto the edge or a pool noodle. Once you are comfortable, try letting go and use your hands to push down on the water. Alternate kicking and pushing down with your hands. With your hands, don't just push down but also move them back and forth as if you were wiping down a table. Practice where you can stand. You can also practice lifting your feet from the ground and just doing the wiping motion without kicking.
Thank you,i will try it next time
Unpopular option, but correct - water threading is more about proper breathing less about limp movement. You talking more about legs suggesting that you maybe focusing on something less important than breathing.