@howsyourdad1 you didn’t ride hard enough if you enjoyed it 😀
@robbie for rollers your need a rear wheel speed sensor and optionally a cadence sensor. You don’t need a Garmin as your laptop is effectively the head unit. I seem to remember that decathlon had bike ANT+/Bluetooth sensors. Your laptop will also need ANT+/Bluetooth receiver. For laptop also read, iPad, tablet, smartphone
I spent 45 minutes riding the new Do As Your Told Sufferfest film tonight, lots of explosive sprints, which on rollers is pretty hard to do. Felt quite easy so either I had good legs of the FTP needs increasing.