Let me start by saying I've tried my fair share of ab mats, and the Yes4All Ab Mat genuinely surprised me. The first thing I noticed was how sturdy it feels - that PVC leather exterior isn't kidding around. When I'm doing my morning crunches, this thing doesn't budge an inch thanks to the non-slip base.

The high-density foam core is where this mat really shines. It's firm enough to support my lower back during sit-ups (no more awkward spine-on-hard-floor moments), but still has enough give to be comfortable. I've used it for everything from basic crunches to more advanced core exercises, and it holds up beautifully.

Now for the real test - travel-friendliness. As someone who's constantly on the move, I appreciate how this folds down to about the size of a thick notebook. It's lived in my gym bag, car trunk, and even came with me on a business trip last month. After three months of regular use, it still looks brand new.

But let's talk about the elephant in the room - comfort varies by body type. At 5'8", it fits me perfectly, but my 5'2" sister found it awkward for her frame. The tailbone support version works great for most exercises, though people with extreme back curves might need extra padding.

The biggest surprise? How much harder proper form makes your workouts! That slight elevation changes everything - my abs were sore in places I didn't know existed after just one session. If you're serious about core work but tired of back discomfort, this mat is absolutely worth trying.