In reply to Turdus torquatus:
A "crack taster day"(don't say that out aloud in the presence of non-climbers!) - climb a finger crack, hand crack, fist crack, offwidth, squeeze chimney, bridge chimney. Could extend by adding thin fingers, fat fingers/thin hands, fat hands/thin fist.
Climb as many no-handhold routes (palming for balance okay) as you can in a day. Obviously an area with many slab routes would be required for best effect.
Another good challenge is the gritstone gallop - climb one route at each major grit crag in the Peak, walking between each crag, finishing where you start. Your grade for the day is the
lowest grade climb of the day. i.e. if you did 18 Severes and 1 VDiff, you did the challenge at VDiff standard. I think the shortest walking route that takes in all the crags is about 26 miles.