Lumbar hyperextends instead of thoracic extending
Lower back arches; upper chest never truly opens.
Overactive muscles
Erector spinaeHip flexors
Corrective work
Foam RollErector spinae↗Foam RollThoracic spine↗StretchDoorway pec stretch↗Mobility · Upper Body
Pec Minor Stretch (Corner Stretch)
Coaching cues
- Stand in the corner of a room; forearms on each wall at 90°
- Lean into the corner — feel the pec minor and clavicular pec stretch
- Chin tucked; thoracic extended — not lumbar
- Hold 30–60 seconds; breathe into the upper chest
Common faults 2
Head juts forward as the chest opens
SCM and scalenes shorten as the chest stretches.
Overactive muscles
SCMScalenes
Corrective work
Foam RollSuboccipitals (lacrosse ball)↗StretchSCM / scalene stretch↗