Basically thee wife wants to get a bit fitter and she wants to do it by riding a bike, one of my bikes.
The most suitable one (one with least faffing) would be my Fortitude Race, she just wants to ride round fire trails in the local forest and maybe venture out onto the odd bridleway once her confidence increases. As it stands the bike has a big bontrager XR4 on the front and a Mud-X out back, a tad overkill for the riding she'll be doing.
Are the Land Cruisers a good choice, are they pretty puncture resistant too? She'll be heading out on her own or with a mate, neither of which have a scooby about fixing a flat.