As a TRX Master Instructor, I am lucky enough to have access to some really great material. TRX as a company really put effort into ascertaining the efficacy of the products, education and programming we deliver. Recently, I came across this article from the Journal of Sports Science and Medicine that outlines the effects of instability training versus traditional resistance training. There were two tools used (and happily, I have been and am associated with both of them), the TRX Suspension Trainer and the BOSU Balance Trainer. I'll let you read the article for yourself but, the conclusion reads as follows:
'Healthy, physically-active individuals or with limited experience in resistance training may either use an instability approach using devices that induce instability or undertake a more traditional training program using free weights and weight training machines in stable conditions. For the traditional approach, larger resistance loads are used, which could be more appropriate for developing muscular power and hypertrophy. In contrast, instability training may be a good complimentary option to vary exercise stimuli within a periodised model. For athletes training in sports such as basketball or volleyball at least two or three times per week, the instability approach could be an interesting option to improve sports performance in terms of gains in strength, power, movement velocity and jumping capacity'.