For all those saying that they struggle with swimming or find it too knackering: keep at it, and if you can, have a few lessons on technique.
It’s a bit like running in that when you start out it is a struggle and it does feel horrible, but the more you do it, the freer and easier it becomes, and like running, there is a point at which you can kind of cruise up and down the lanes without getting out of breath and without having to concentrate too much on what you’re doing. This is when your mind can switch off and when it becomes relaxing, physically and mentally.
If I was to offer some quick tips on technique they’d be:
Front crawl: SLOW DOWN and stay long. Too many people crash through a length, splashing everywhere. It’s far better to slow down your cadence and make sure that you use the full extent of your reach. An easy way to help with this is to breathe out when your face is in the water and to stop ‘windmilling’ your arms: your hand should enter the water in front of you just as your other arm starts its pull. Too many people put their hand in the water when the other is down by their hip.
Your feet should barely break the surface of the water, but also, your legs shouldn’t drop. To help this, don’t hold your head too high when breathing.
Breaststroke: The problem with breaststroke is that you can have really bad technique and it doesn’t knacker you out (unlike front crawl), so it’s often the stroke that people do without really thinking about whether they are doing it right.
Again, stay long. Keep your heels just below the surface of the water. The best way to do this is to snap your ankles together at the end of a kick - don’t kick out and down, but back and together. Bring your heels up to your bum, rather than your knees up to your chest. Don’t lift your head up so much that your bum drops down - it’ll slow you down and can cause you problems with your back.