The Day 6 version of the fat bike is here.  Great on the snow and sand (and rock roads) but also great on the back.  The Mission Command 24×4.0 tires with low pressure take the hit when going over objects and through holes so your body doesn’t have to.  The rear seat position on the Day 6 improves traction in the snow but bring your legs.  Riding in snow and on softer surfaces is going to give you a workout!  Motorized versions to come soon.

HINT:  Put a bit more air in the front tire.  It will steer better and the softer rear tire will give you a cushioned ride if you want.