Functional or Dysfunctional?Just because a particular piece of equipment is called "functional," does not guarantee you (or your client) a functional response in the body.
More often than not, dysfunction will be the result of many of the "gadgets" that are used in training. Tools such as the Bosu, dynadiscs, wobble boards, stability balls, etc., are great tools if used properly.
If someone's foot/ankle is siezed (limited dorsiflexion/pronation/supination)and now they stand on a Bosu with one one doesn't mean that they are now functional. If the body cannot get motion from a specific area, then it will get up from somewhere else in the chain...optimal or not!
We have used and continue to use the body as the main source of functional equipment. Manipulating the body with respect to gravity, momentum and ground reaction forces are the epitome of function as these forces are something that we all will have to deal with --some more than others.
All in all, tools are great and use the tool that the job demands. There is a ton of great equipment out there, just don't forget the goals, needs, wants and abilities of the individual who is to be using it. In many cases, less is most often more!
Train Hard and Ski Harder!