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Here is some info from Andy Coggan relating to "strength endurance" and, ultimately, the exercises he describes end up being hard standing starts and microintervals.
Late last summer, I was pretty much done with most of my training and just going to ride off my fitness. I still had some criteriums coming in the next 4-6 weeks and since I was bored with most of the other training I had been doing, I thought I would take this up.
Keep in mind that my sprint was only average and most of that is because I did not train it. In fact I had let it go to "fallow" over the previous two years. I was not getting into the breakaways that I needed to and so I figured that I shouldn't even bother with my sprint. In any case, late last summer I started doing hard standing starts and the 15/15 microintervals, two times each week. Within 4 weeks, I had brought my 5-second maximal power (from a standing start) back to my best ever recorded, an ~15% increase.
There are probably several reasons for this. One is surely that since I had not spent any time seriously training my sprint in about 2 years,
any training would probably show good gains. Another is that I show peak power in my sprint very early on, during the high torque portion of the sprint. The hard standing starts made huge gains in that. In a crit, I'm rarely sprinting from a slow speed so I'm not sure how applicable that is. I also don't know if the microintervals did anything for me (other than make me very tired
) In any case, it was an interesting experiment.