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I'm not a great swimmer, although I have done the Midmar Mile (1600m) a few times. I get lost counting lengths in the pool, and I battle to stay motivated, let alone fit.
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But I do understand maths, and I use it to my advantage when training. In a 25m pool it takes 40 lengths to swim 1km. Most people assume that if you want to swim 40 lengths its best to do 4 sets of 10. That may work for them but if I try doing that I battle to swim the last 10 and get completely demotivated for next time.
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Instead, I do 5 descending sets of 10-9-8-7-6 lengths. That's 4 breaks instead of 3, but the last set of 6 isn't as tiring. If you don't want to look spare resting at the "wrong" end of the pool, do a descending set of even-numbered lengths, like 10-8-8-8-6 or 12-10-8-6-4. If you're doing even steps then the middle number multiplied by the number of sets gives the total no of lengths.
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At present I'm not even managing that number, but if you're unfit and start a 5-4-3-2-1 set you've already done 15 lengths. Next time do 6-5-4-3-2 and that's 20. At present I'm doing 10-8-6-4-2 (30), and then I add a couple more at the end to keep motivated.
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In order to stop getting lost when counting lengths, I do 2 lengths of crawl followed by 1 length of breaststroke. If you are swimming 10 lengths, start and end with breaststroke. Then lengths number 1, 4, 7 and 10 are breaststroke, with 4 and 10 in the "back" direction and 1 and 7 in the "away" direction. It's easy to tell where you are in the set simply by knowing what stroke you did in the previous length and which direction you are swimming.
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When I was training for Midmar and wanting to keep count of 64 lengths, I used coins at the far end of the pool. I moved 16 coins from one tile to the other, and then moved them back again, i.e. 32 moves for 64 lengths, swum in pairs. That's 15-14-13-12-10 if you're doing 5 sets, but I was trying to do the entire lot without a break. After all, there are no "sides" at Midmar dam.
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