I'm 5ft 8in, my waist is 42in, I don't really need an extender but I use it because I wear a sweatshirt when I work out and it's thick and heavy. I have an iPhone 7 Plus with a case and a pop-up gizmo on the back, and not only does it fit, I can slip my ID and a few bucks in it. Now that I have a newer iPhone, the little headphone hole was very tight, can't lie, I had to use my teeth and tweezers to get through and I just left them there, too much hassle to remove. I would suggest investing in a set of Bluetooth headphones. I have a large Kia Soul key and it fits snugly in the little pocket on the side, if you're trying to add more keys don't do it, the little pocket isn't that big. The belt stays in place when I run (about 2 minutes because I'm out of breath. I'm so out of shape) and I can easily slide it aside when I'm doing that awful machine that makes you grind and because hurts you are using your own body weight. Yes the belt slips easily from side to side so I can do this horrible exercise. I love and hate the belt equally. I love it because now I can workout without dropping my keys and phone, I hate it because now I can't use my keys and phone as a reason not to workout. .
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