You can actually hurt your neck just walking through the redwoods of Northern California... all that looking up at the tall trees can leave you sore.
You can add soreness to your legs by taking a mountain bike into the woods.
And the opportunities to do that may expand; mountain bike enthusiasts want to turn some decommissioned former logging roads into bike trails in the redwoods. Adam Spencer, the founder of , a biking/kayaking trip company, visits to talk about the overall plan, and the coming (in September) Redwood Cycle Fest. Redwood Rides Marketing Director and Cycle Fest Co-organizer Chelsea Baier joins in.