Spiderman couldn't give better training than this Davis rock climbing gym.. In Short No need to spend half your weekend driving to Yosemite for a day on the rocks; the Rocknasium brings the mountains to you. Here you can scale faux rock walls, feel the rush of adrenaline and conquer the great indoors. From beginner to expert, it offers a variety of opportunities to advance your climbing skills in a safe and controlled environment. Need to pump up a little? No problem. The gym also has weights to get you looking like Popeye after the spinach.