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. On our fitness bikes, you will be using your glute (bottom), hamstring (back of your thigh), quad (thigh), & calf muscles. There is a bar graph integrated into the console that lets you know where your heart rate is in relation to projected maximum (calculated when you enter your age in the programming section of each program).