The good balance between force and finesse. Many people rely too much on strength, both when climbing and playing the guitar. For example, guys who work out tend to overuse their upper body when climbing, to the detriment of their footwork and mental ability. Girls, on the other hand, aren’t necessarily as strong, but they can make up for this with technique. The key is to find the right balance. I’m a huge fan of Ashima Shiraishi, a Japanese-American climber. She’s only 154 cm tall, but she’s really flexible. Ashima uses excellent technique to overcome her physical limitations, so she can find alternative ways of finishing a climb.
In this regard, climbing and music are similar: there’s more than one way to play a chord or climb a route, and each has its own unique style and qualities. For example, when you strum a guitar, if you pinch the pick too hard, it can sound rigid. But when you perform on stage, you sometimes want to exaggerate more and let your emotions run free. In other words, in some circumstances you need to be more gentle, and in others more passionate. If you watch a good climber, they can stick to the wall like a magnet by using body tension, but this requires a great balance between force and finesse.