Get Your Swim On For That Spring Sprint

Here's a good main set for working on speed for a 500 - 800 yard swim in one of the spring sprint distance tris that are popping up like daisies this time of year...

3 x
{2 x 200
2 x 100
2 x 50}

I did this one tonight, and tried to make the 100's add up to less time than the fastest 200, and the 50's add up to less than the fastest 100. Then I tried to make each of the three sets a little faster than the last. It looks like a simple set, but it turned out to be fairly tough in the end!