Hi to everyone, I'm a fresh member in here. I started swimming 4 years ago, I consider myself a recreational swimmer but with a tendency to compete in Masters European Champs when I hit 25(am 22 now). To do a short background : I have some decent speed ( 25" 20) in a 50 free SC, but have no endurance, my 1500 best is 19:53, a 5k around 1:16. I also swam a 10 k , time was 2:45. So my question is how to transform that speed into long distance speed, how to gain endurance BUT not to lose speed. Do 400 intervals, 40 sec rest, or shorter distances? I plan to swim 6-7 5k swims, and one 10 k..
