In reply to The Lemming:
The rule of threes:
every story has a beginning, a middle and an end, usually in that order. (Think of the typical news programme - tell 'em what you are going to tell 'em; tell 'em; tell 'em what you've told 'em. )
Get three different angles of things: a wide shot; a medium shot and a close up. Mix these up in editing.
Use a tripod or some sort of support even if it's just perching the camera on a rock.
Don't follow the action around, it makes you look like some sort of paparazzi, let the action come in and out of shot.
Think about continuity: if person A is looking to the left talking to person B then the shots of person B should have them facing right, that sort of thing.
Get additional material, things like eating grub in the cafe; driving to the crag; gearing up.
When editing keep each shot fairly short, 3 - 5 seconds unless the scene really does deserve more. That doesn't mean you just shoot 5 second clips but that you edit them that way. Cut between shots on the beat of the music or every other beat. Mix them up so change on one-two-one-two beats. Don't use cheesy transitions between shots: either a straight cut or fade to black/white.
Keep the whole thing as short as possible, maybe the length of one music track - I got the three days of mountain biking in to six minutes.
Post edited at 22:35