In reply to jason1993:
I like your post. Nice to see an aspirant SPA taking the trouble to think about different scenarios, rather than just getting the piece of paper as quickly as possible.
The suitability of a particular warm-up activity is obviously dependent on the crag and its surrounding terrain, as well as on the numbers, experience and physical condition of your clients. There are, of course, various other factors: session time constraints, weather conditions, etc.
Of paramount importance is safety of the group. Sounds obvious but in practice it's easy to get priorities distorted. For example, bouldering/spotting can be a great idea but perhaps not on slippery rock or with muddy sloping ground underneath, or if your group have unsuitable footwear. Dynamic warm up exercises and those involving stretching exercises can be good, but these may be unsuitable if there's a significant risk of injury.
Personally, I tend not to do exercise or game-based warm-ups with adult groups outdoors. There are various other ways in which a warm-up can be provided. A walk-in to the crag will provide a general aerobic warm-up, as will a visit to the crag top with the whole group. If you are in the position of having to meet the group before setting up, consider taking them all to the crag top with you, and get them to carry some ropes. You can get them interested in the rigging process (be clear about safe/unsafe zones at the cliff top).
A more climbing-specific warm up will often not be necessary, but if it seems warranted, and the terrain is suitable, a short session of easy, low-level bouldering is good for adults. You can introduce spotting skills, as well as a variety of movement skills. Gentle stretching can be done on the rock by maintaining foot and handholds while moving the centre of gravity around.
If a game-based warm-up seems called for, some of the more difficult group games are fun for adults and, if suitably challenging, shouldn't be perceived as patronising. Those which involve both mental skills and physical coordination are likely to be most suitable (I was recently shown a great one called The Typewriter). A bit of Googling should give you some ideas.