Speedcoach is talking about training Max V. Rarely does an athlete have a 60m straight run that will allow him to reach his Max V. I would bet if 60 players touch the field, only one or two will reach his terminal Max V during a game. However acceleration is another matter. Improving a players ability to reach 90-95% of Max V quicker is more important. If player 1 improves his acceleration and can reach 95% of Max V quicker than before, but his Max V doesn’t change, he’s made significant progress that will contribute to his success on field. If player 2 improves his 100% Max V but his acceleration curve remains unchanged (only extended), he will have made little impact on his onfield performance.