Affect of 15% weight reduction on speed

Former Member
Former Member
Hi all - I have an odd post for you to ponder :) Recently I've decided enough is enough and it's time to shift some unwanted poundage. Over the past few months through exercise and eating much better I've dropped about 15% of my original body weight, going from 207lbs to 175lbs. At the same time I've been swimming a bit and making an effort to keep on some muscle too. I know it's a very very hard question to answer but am looking for people's estimates on what this sort of weight loss would do to your swimming time over longer distances if I was able to keep everything else static (stroke, flexibility, strengtht etc). The only difference if possible would be there would be less body weight, and hopefully a better shape for moving through the water. I know that due to water being denser it's not as easy to say as it would be in relation to running etc, but say over a 5km open water swim, what would people guess the % improvement would be as a result of this? Cheers GC
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  • Former Member
    Former Member
    get what people are saying - to be honest I didn't plan to loose weight just happened as result of food intolerance diets to isolate problem etc. Totally agree best plan is simultaneously eat well and exercise more. However, back to the original item - I still think if you could keep everything constant (and again i know it's hard to ensure this), how weighing less wouldn't lead to an increase in speed. I know the gains won't be as obvious as they are with running, where if you weigh 12 stonne you are making 12 stonne run, as in water the buoyancy and density affects this and it isn't 1 to 1 anymore. I think for the most part people are saying the same - that things change, but that weighing a bit less should help the swimming speed if I can keep the strength and stroke going. Again thank you all for the comments and replies - am blown away by the amount of them! Thanks
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  • Former Member
    Former Member
    get what people are saying - to be honest I didn't plan to loose weight just happened as result of food intolerance diets to isolate problem etc. Totally agree best plan is simultaneously eat well and exercise more. However, back to the original item - I still think if you could keep everything constant (and again i know it's hard to ensure this), how weighing less wouldn't lead to an increase in speed. I know the gains won't be as obvious as they are with running, where if you weigh 12 stonne you are making 12 stonne run, as in water the buoyancy and density affects this and it isn't 1 to 1 anymore. I think for the most part people are saying the same - that things change, but that weighing a bit less should help the swimming speed if I can keep the strength and stroke going. Again thank you all for the comments and replies - am blown away by the amount of them! Thanks
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