No, road bike on a trainer. The really high spinning was in the bike's easiest gear, 39 x 23.

We also do a lactate tempo ladder using the 53 x 23 or higher for lower level groups who have the 25 or 26 gear. In that drill everyone starts out at 100 rpm's as the low and 120 rpm's as the high. The interval begins for 55 seconds at 100 rpm, then 5 seconds at 120 rpm's, then 55 seconds at 100 rpm's then 10 seconds @ 120 rpm's, each minute has 5 less seconds at 100 rpm's and 5 additional seconds at 120 rpm's. Eventually we get to 5 seconds at 100 rpm's then 55 seconds at 120 rpm's then the cruel instructor will say "0- 60 just keep on going" That drill really hurts! One thing to point out is the drill was progressive and at the start of the program we only worked up to 45 seconds at 120 rpm's and added additional time every other week.