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I will be swimming five days a week before the course, and have a reasonable cardio vo2max base from turbo training. It’s more that I am going in looking to work on technique with low expectations about suddenly becoming a fast or endurance swimmer. I’d just like to get to the point where swimming for half an hour doesn’t sound like an impossible proposition
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I took swimming lessons when I was 30. Couldn’t swim front crawl at all before that but had signed myself up for a short triathlon so had a bit of motivation.
Front crawl is all about technique, once you’ve got the breathing down, you stop worrying about taking a lungful of water and relax a bit. Makes it much easier to focus on the technique and spend less energy thrashing about. Practise makes perfect, though. I soon realised the lessons alone weren’t going to help unless I got in the pool regularly. You’ll get there.
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I will be swimming five days a week before the course
Good, that's the important thing.
and have a reasonable cardio vo2max base from turbo training.
I went back to swimming a few times in my life, once after doing London-Edinburgh-London and another time after marathon training.
Both times I was fucked after no more than 400m of swimming. Second time in the pool I managed 800m. Third time 1200m. Etc, etc.
CV fitness is great, but nothing beats time in the pool doing actual swimming.
tl;dr Turbo training does fuck all for the shoulders.
Yes, but any technique falls apart very quickly if you've no endurance.
Even if you're swimming is very splashy you'd get more out of a three day course if you go into it with some endurance base. You're not going to hammer in so much dreadful technique in a month that it can't be undone pretty quickly.