Asymmetry between left and right side will cause compensations to occur with strength training.
Compensations are normally where injuries occur.
As @emrys_goldsworthy_bhsc took our members through in a work shop recently the above thoracic rotation drill can be a predictor of asymmetry in upper body movements especially pushing.
Other tests that can be used (and we do in consults) is differences in hip flexion, ankle range and shoulder rotation.
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