I worked on my starts today and it was VERY ugly. I did 15 of them ranging from 10m - 40m. I have done lots of flying start 20-60m sprints last week and even standing start and did them well in relation to my ability. I guess my question is, on average, how long have you noticed people take to learn to use the blocks well? I can always jump into races with a standing start but that is a big disadvantage and I need to learn these before going into a 100-400m race.