I used your 1800 yd. workout this morning and I was finished in about an hour. It fit into my hectic scheldule and even left me makeup time. I was very happy about that. I liked the last 100s on the 300 sets because I got to go all out. Its always a good thing when I get through and am trying to catch my breath, it makes me feel like I gave it my all. I like sprints. Thanks for posting an energetic but time efficiant workout it was beneficial.