Tendo Barbell De-Stabilizer
References

1. An electromyographical comparison of trunk muscle activation during the military press performed with and without a unique instability device,
P. Comfort., D. Mather, & S. Pearson. Centre for Rehabilitation and Human Performance Research, University of Salford, Manchester

2. Changing the stability conditions in a back squat: the effect on maximum load lifted and erector spinae muscle activity,
DOI:10.1080/14763141.2014.982697 Iain M. Fletchera* & Ashley Bagleya, pages 380-390
www.ncbi.nlm.nih.gov/pubmed/25434609