Chapter 1: Sitting 🔒

Phrase 1: posture

Phrase 2: good posture

Phrase 3: watch for good posture

Chapter 2: Lifting 🔒

Phrase 1: back

Phrase 2: back straight

Phrase 3: keep your back straight

Chapter 3: Hazards 🔒

Phrase 1: strain

Phrase 2: muscle strain

Phrase 3: try to avoid muscle strain

Bonus Chapter: Improvements 🔒

Phrase 1: tool

Phrase 2: better tool

Phrase 3: is there a better tool for this?