First : I've had an abces in the left psoas muscle so that's a first clue.
Second: when I am in the lunge stance, the ankles aren't as wobbly as the groin area. However, it is true the ankle isn't terribly mobile and I've needed using a plate under the heels to get down properly and now am using olympic shoes with a raised heel.
Third: I'm absolutely terrible in sit-ups.. can't even do one for the life of me, despite decent ab strength as whole lower spine is more or less immobile, so that's indeed also lacking hip flexibility.
But most of all it's the stark difference between left & right that points to the psoas as this was the affected muscle many years ago. For unilateral leg presses there's also a strength difference but it isn't as noticeable.
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