I usually don't put the roller between the door frame for more than 2 sessions.
10-20 minutes after I get on the rollers I feel comfortable enough to get on/off the bike on rollers in open space.
Usually I do my spin work on rollers, 140 rpm for 2 min in every gear from the lowest to highest I can mange... with 2 min easy cruise between gear shift, fixed gear need not apply.
If I do manage to watch a football game on the rollers, sprint with each snap, cruise between each play, 45 min is a good workout.
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