I was making my inaugural climb.Thanks to Ben Bonnett, who is part of the trained staff at the Stonehenge Indoor Climbing Gym, I was properly fastened and ready to begin that ascent up the indoor rock-climbing wall, which is an artificial structure consisting of climbing holds of various shapes and sizes, and situated randomly or in specific routes.Bonnett provided instructions on threading the rope through the harness. Included was the figure-8 follow-through knot attached to my climbing partner – in this case, Thomas Coyle, 18, of Tracy – who was anchored down on the ground and responsible for my safety while wearing the belaying device.He, too, was given a crash course on the proper technique on belaying. Thomas’ job was to control the tension on the rope on the ascent and to safely release the rope to help guide down the climber.Located in downtown Modesto, Stonehenge offers 4,000 square feet of rock climbing, 40 feet top rope wall, 50 feet walls to lead climb, and a cave and climbing shop.Cost for first-timers is $20, with instructions provided.