Trail work Experience is a hard teacher because she gives the test first, the lesson after. There are a lot of opportunities ranging from physically demanding trips into remote areas, to a day hike with a paintbrush. Work with established land use officials and organizations. Don't get all fired up and try to create a new group without experience. If you haven't done trail maintenance work join a 2 or 3 day work crew and get introduced.
Some clubs have specific introductory courses in trail maintenance.
Most folks do not have the slightest idea of what they are in for when the flyer says be prepared for hard work under adverse conditions. If you have a medical condition, don't lie about it. Cautions on Physically Demanding Trips At Altitude. Do not apply for these unless you are experienced in working at high elevations. The following listing is of groups organizing backcountry volunteer trail crews.