Dancing in Spikes - I have oodles of training sessions, our tri club coach gives us a new one every session and I have been collecting them for the past two years. They are mostly more than 3000m in length but you could always leave some out. I did post loads of them on this thread last year because people kept asking me to but if you don't want to trawl back looking for them let me know and I'll PM you. Here's a sample.
1000m easy warm-up - 25m dolphin kick, 75m freestyle, 25m breast, 75m free, repeat.
6 x 200 - ist one easy, 2nd breathing 3/4 rhythm, 3rd fast.
400m freestyle with pull bouy (PB), long 3 - i.e. glide looong on every 3rd stroke.
100m freestyle, fist drill (fists open, fists closed. repeat, etc.
800m cooldown - count strokes for 100m, reduce the next by 6, repeat.