There were mountainbikes, and then there were hybrids with 700c road wheels, the hybrids eventually became leisurely riding bikes rather than performance road style bikes, with an upright riding position, and sometimes a suspension seat post to save your rear and back. The next step was to take all this comfort, and fat tyres for stability and dirt riding ability and you now have a choice of on or off road comfort cycling. (still not quite an arm chair but nobody gets fit and healthy on their arm chair).