Low Back Test - Low Back Test is very fast to do: test itself takes only 60 seconds and result printout is produced in a few seconds. Low back test of eMotion EMG is a fully automated measurement of back muscle function during isometric test (Sorensen test). Test gives an accurate measure of endurance of each muscle, balance between muscle groups, and estimation of injury risk to assist muscle re-education. Main outcomes of Low back test: Endurance of each muscle group Balance between left and right side Balance between erector spinae and multifidus muscles Weakest link of muscles Improvements between test sessions Injury risk assessment