We always used to just refer to it as a nightmare when in the reseraves. However tehcnically it is usually referred to as an Assualt Course (at least in UK). Normally include at least a couple of walls (to get over at 6 & 10 foot in height), scramble nets, swinging bridges, tunnels (Royal Marine one has a nasty Water Tunnel), pits to swing over (on ropes), barbed wire to crawl under, monkey bars (swing hand to hand between), balancing stuff etc. Designed to represent obstacles and/or terrain that a soldier might met. Tend to be a few miles long (RM one is 5km) and you tned to go round it once with a running between obstacles - in full battle dress as well.

Some pictures of civilian equivalent in UK here. More can be found on the 'Net I am certain :)

Hugs

Arwen :)