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This thread reminds me of something I saw at my gym and then something a friend has gone through at his physiotherapy.

The other day at my gym a young guy came in to be trained and the first thing the trainer had him do were bent-over-rows on an upside down BOSU ball (standing on the flat side). This poor guy had never done a Row before and now not only does he have to learn the form but he has to keep from falling off the ball as well.

The second thing isn't quite training on an unstable surface but it is similar. A friend of mine recently had a cast removed after breaking his leg. For his physio they are having him stand on the bad leg, on a trampoline (hopping lightly), while they toss a ball at him which he is to catch and throw back. I can't remember if it is a medicine ball or something lighter. I just can't see this being a legitimate recovery technique, it seems like they are just screwing with him.