So you're in the car on the way to the crag. You know you're only going to get an hour at best before you need to get the kids from nursery. You can't be spending value rock time warming up for 20mins... in comes the car based warm up! I generally go for open handed drags on the top of the steering wheel, steering wheel pinches and assisted one armers using the coat hanger handle above the door. What are your top tips for the car based warm up.
(I realise this is wide open to smutting comments about warming the fingers up in the back seats, but lets try and avoid those!)