voice mechanism

loud & long speak is bad

hydration is important

Rebound knee, back knee, hyperextended knee

Quadriceps training

Shoes, insole

・Specific / Non Specific low back pain

・Non Specific → intervertebral disc, facet joint, muscle or myofascial

・Posture / Flexibility

・Stretching / Exercise

・conさん's self introduction

・freelance work

・vocal hygiene