Spine

Pelvis

core strength

abs

obliques

erector spinae

injury if exposes to shear

secure when compressions

flexion

extention

Risk

Common injuries L1-L5

1. Large force, low-velocity muscles of the core (abdominals & spinal erectors) + hips

2. Small force, high velocity muscles (biceps, calves, wrist, etc)

Allow great work capacity

midline stabilization

midline stabilization

by itself is not terrible risky

Muscles

tendons

ligaments

base to transmit forces

Knee position

Pressure in the feet

Flex

Extend

Muted hip

Lack of extension

slow hip extension

weightlifting

gymnastics