During witch training period do you like to place whose contrast method workouts with assisted sprinting? I hear some coaches saying that assisted sprinting might be effective. I saw a female sprinter in a city where I coach being towed last winter for a few sessions before European indoor champs in Paris. Before her 60m PB was 7.31 for a few indoor seasons but coincidence in Paris she made 7.28 and 7.27 in semifinal. Bad news was that she got injured in hamstring area right at crossing finish line. With 7.27 she was eighth and could run in a final but of course she didn’t. The thing is she didn’t use assisted methods before and never had hamstring injuries. Maybe she could escape that if she had proper therapy witch she doesn’t have in our city.