Friction

When it comes to comes to staying in shape I confess to being utterly useless in a gym. I much prefer climbing as a way to exercise - it's like solving a 3D puzzle with your entire body. So when the weather doesn't allow outdoor climbing, my favourite place to go is the Westway Climbing Centre. Given the choice I'd always pick bouldering over routes... there's something pure about doing away with ropes, harnesses etc.