SIMIEN Flexible Rubber Twist Bar

I was surprised at how stiff this was even with the yellow insert or none at all. I’m recovering from tennis elbow and for therapy it should be way easier to twist than this. It is also quite large in cross section but that is due to the use of inserts that slide through the middle and I’m not sure that is a problem for its intended use. I’m a pretty strong guy but an injury does not require a lot of resistance initially since the intent is to strengthen weakened muscles and tendons and regain range of motion. Too much resistance can exacerbate the problem if used too soon. I may order a light Therabar to complement this set. Otherwise, if just used for strengthening exercises without an existing injury it is good. UPDATE: I cannot say how impressed I am with Simien LLC. They do read reviews and proactively reach out if they feel you were not satisfied. They noted my comments and I provided some feedback as to how their product could improve. They informed me that they had had a number of similar complaints about a specific batch they received from the manufacturer and were looking into it, promptly refunding my purchase price. Customer service does not get any better than this. I upgraded the rating to 4 stars because as a general exercise device it does work well, just that for the described therapeutic use it was too stiff. I hope they are able to address this problem and that it was just a bad batch. UPDATE 2: Simien LLC is in a league of their own for customer service. They redesigned the formulation of the rubber and sent me a new item. The new item is far more flexible than the original one both in torsion and flex. The primary change seems to be in the formulation of the outer sleeve which is much softer and more flexible than the original one but all of the inserts seem a bit more compliant also. I can now recommend this product without reservation. Please support this company, they work hard for your business, stand 100% behind their products and definitely deserve it. I do not work for them and have no affiliation with them other than as a very satisfied paying customer.