Pedal easily at 150rpm?! Wow, not me! I can probably get there-- I haven't done sprint workouts in awhile, so I forget where my top end is, but it's not unusual for me to hit mid 130 for second or two-- but it ain't what I'd call "easy pedaling." Then again I'm old, 100kg, and not trying to win any national track titles...unlike this guy, who spins up and holds it well north of 200rpm: