Durable, comfortable, & smooth are all qualities of the Spirit Fitness XBU55 light commercial fitness bike. Easy adjustments, a cooling fan, high density foam seat, challenging programs, 20 levels of resistance, & a bright LCD display are all standard. Indoor exercise bikes have been around for many decades. Their appeal & effectiveness have stood the test of time. Comfort, convenience, familiarity, enjoyment, & medical conditions are a few reasons this modality appeals to a large segment of the population. A heavy duty 30 lb. flywheel results in more inertia (Revolutions per Minute & Watt output). Muscle activation console feedback, it’s important to understand which muscle groups are gaining the most benefit during your workout.