100 steps a minute sounds like normal walking speed.

With 70 cm step length it means 4 km/h, which is slow walking.

20-25 steps/minute, with 70cm step length will take you to the toilet in one minute.

My brisk pace would be about 120 steps a minute, with 80 cm step (I have long legs), that is about the speed I can sustain for longer time without any sweating.