Feels good afterwards, not so much at the time I don't find, not by the fourth one anyway.
I bought myself a waterrower and I love it. Quite spendy these things but I got it for cheap on ebay as it was all knackered and neglected when I picked it up from some footballers mansion house in Chester.
Should have taken some before pictures but I did a full repair shop on it. Stripped it down, sanded all the wood, a few coats of danish oil. Also the LCD and the buttons weren't working so took that all apart and fixed it, couple of new parts and now it's absolutely mint, so satisfying.
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Anyway been doing 5K on that every day and then a bit of running as and when, my knees feel better than they have for years.
Keep a towel close by...