Does Instability Training Really Work?
Many people do exercises such as squats and lunges on unstable platforms such as BOSU balls, wobble boards and Swiss balls. The theory behind instability training is that the body must activate more muscle fibers to maintain balance during the exercises. People exert less force when doing large-muscle exercises on unstable surfaces. However, the method would be useful if it improved balance and stability during sports movements, which would improve performance and prevent injuries. Researchers from the Memorial University of Newfoundland in Canada found that many instability-training devices did not cause additional muscle activation in experienced weight-trained athletes. They measured muscle activity in the calf, thigh, abdomen and spine while the athletes stood or squatted on a Dyna Disc, BOSU ball, wobble board, Swiss ball or a stable floor. They also measured muscle activation during standard lower body exercises performed on the floor or unstable Dyna Disc and during static wall-sits on the floor or BOSU ball. They only showed increased muscle activation on Swiss balls and wobble boards, which provided the most instability. The study showed that trained athletes need highly unstable surfaces to recruit additional muscle groups during standard exercises. (Journal Strength Conditioning Research, 22: 1360-1370, 2008)
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Many people do exercises such as squats and lunges on unstable platforms such as BOSU balls, wobble boards and Swiss balls. The theory behind instability training is that the body must activate more muscle fibers to maintain balance during the exercises. People exert less force when doing large-muscle exercises on unstable surfaces. However, the method would be useful if it improved balance and stability during sports movements, which would improve performance and prevent injuries. Researchers from the Memorial University of Newfoundland in 
