Carlos Dinares uses the acceleration sound to teach good acceleration and make understand the rowers he coaches what acceleration feels like. For Carlos Dinares acceleration during the drive is a very important thing to achieve. Carlos uses the sound of the flyweel accelerating to teach what good connection and pry can produce. Carlos shows you in these 2 videos what the acceleration of 2 different rowing machines sound like. Also you can see on these videos that the rowperfect3 rowing machine has more connection, pry and a solid consistent drive when the stationary concept2 feels empty, hallow and lacking a consistent drive through.