I just did a bike ride that was a fundraiser for the Arthritis Foundation and, while I don't have arthritis yet, several of the riders do suffer from arthritis and were still able to ride hundreds of miles down the Oregon Coast! Most spoke highly of biking as a form of exercise that helped get them active without aggravating their arthritis. Here's a link to the webpage about the ride, http://www.thepeoplescoastclassic.org/cause/ and here's a link to the arthritis foundation http://www.arthritis.org/chapters/washington/ Perhaps by poking around these sites you can get some more information that would help your boss. Hope this helps!