He's got that lean they call the "fentanyl fold"

[littlemissmartypants]

35. Pelvic Tilt

The pelvis, with its anchored sacrum, serves as the foundational base for spinal alignment, with its position in the sagittal plane being determined by the delicate equilibrium between opposing muscle groups that create either anterior or posterior pelvic tilt.[12] Pelvic tilt is a key component of spino-pelvic alignment and has a great affect on overall posture.[13] According to the classical mechanical model, posterior pelvic tilt (also called retroversion) results from the coordinated activation of the gluteus maximus and hamstring muscles, which effectively lower the posterior pelvic rim while elevating the anterior edge, thereby reducing overall pelvic tilt. This movement can be enhanced synergistically through simultaneous activation of the abdominal muscles, (e.g. rectus abdominis, obliquus, and transversus), particularly when the sternum position remains stabilised. Conversely, anterior pelvic tilt (also known as anteversion) occurs through the antagonistic action of the iliopsoas, rectus femoris, and lumbar erector spinae muscles, which collectively increase forward pelvic rotation. The resting pelvic position therefore represents a dynamic equilibrium state determined by the relative activation levels and force contributions of these opposing muscle groups, with this simplified mechanical model assuming symmetrical bilateral muscle activation patterns that may not always reflect the complex reality of human postural control.[12]

https://www.physio-pedia.com/Posture