? Core Strength. The T-spine allows for actualization of core and hip strength. If the T-spine is locked up, we literally lose the ability for the core to function dynamically and strongly while running. All the planks and sit-ups in the world will not solve this problem (in fact, sit-ups could make this worse). We know that a functionally-strong core promotes quality and efficient running, not to mention injury-free running. And "core" includes the hips and their ability to move well.
? Underlying Weaknesses. Sometimes a rigid T-spine is the direct result of other weaknesses while running (or just living in general). In other words, the T-spine will stiffen to save you from your sloppy form. If your core is weak to begin with, it can put extra strain on the T-spine, causing it to become overly stiff because it's having to work overtime. Also, if hip flexors are tight and causing an anterior pelvic tilt (pulling the pelvis forward), the T-spine compensates by stiffening up to provide any support possible. It's a bit of a chicken-or-egg situation—what's causing what?
More: 5 Hip Flexor Moves to Boost Speed and Prevent Injury
? Not Getting Results. Do you feel like you're missing out on speed and strength despite tons of dedicated hard work, good eating and recovery? A locked up T-spine could be to blame. The stiffness and malfunctioning in this region may be the underlying reason why you're not seeing physical results from the hard training you put in. Good, upright posture with shoulders back will make you appear leaner and more ripped in the shoulders, arms, chest and core—but the hunched T-spine will directly prevent this aesthetic bonus of training.
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