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STILL IN MOTION
Because slowing down isn’t in the plan.
TUESDAY DEEP DIVE: THE STRETCH
Sunday’s issue introduced the Standing Doorway Chest Opener. Today we build a complete pre-cardiovascular mobility sequence addressing three distinct layers: anterior chest, thoracic extension, and rib cage lateral expansion. Together they take under six minutes and measurably improve breathing efficiency during any sustained cardiovascular effort.
Cardiovascular capacity is limited not only by the heart and lungs but by the mechanical structures that allow the lungs to expand fully. The rib cage attaches to the thoracic vertebrae, and stiffness in either structure reduces respiratory excursion — the volume of air moved per breath. People with stiff thoracic spines and tight chest musculature breathe with reduced efficiency at any given effort level, which means their heart has to work harder to compensate.
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DRILL 1: DOORWAY CHEST OPENER — THREE ARM POSITIONS
Sunday’s featured stretch. The arm position determines which layer of the chest is targeted:
Elbows at shoulder height: targets the mid and lower pec — most relevant for people who feel tightness across the middle of the chest during deep breathing
Hands near the top of the frame, arms overhead: targets the lower pec and upper abdominal fascia — relevant for restriction felt in the lower chest
One arm at a time, angled at 45 degrees above shoulder height: targets the pec minor and anterior deltoid specifically, most directly improving overhead breathing mechanics
Spend the most time in the position that produces the deepest stretch. Perform before any sustained cardiovascular session.
DRILL 2: SUPINE RIB CAGE LATERAL EXPANSION
Best for: People who feel restricted breathing into the sides or back of the ribcage, or whose Zone 2 breathing feels labored despite adequate cardiovascular fitness.
How to do it:
Lie on your back, knees bent, feet flat
Place both hands on the lower ribs, fingers wrapping to the sides
Breathe in slowly through the nose, deliberately expanding the ribs sideways into the hands — not just lifting the chest upward
Hold 3 seconds at full inhale, then exhale slowly and fully
On the exhale, gently press the hands inward to assist rib cage compression and full air expulsion
8 to 10 breath cycles
Lateral costal breathing — expanding the lower ribcage sideways — is the most efficient pattern for sustained aerobic effort. Most people have this capacity suppressed by chronic upper-chest breathing. Two minutes of this drill before Zone 2 work measurably improves breathing efficiency during the session.
DRILL 3: BRIEF THORACIC EXTENSION OVER FOAM ROLLER
A condensed version of the full thoracic extension work from Issue #28, specifically for pre-cardio preparation:
Place the foam roller perpendicular to the spine at the mid-back, roughly at shoulder-blade level
Support the head with both hands behind the neck
Let the upper back extend over the roller — hold 5 slow breaths, each inhale expanding the thorax over the roller
Shift the roller up two inches and repeat once more
Total time: 2 minutes
Pre-cardio sequence: Foam roller (2 min) → Rib expansion drill (2 min) → Doorway chest opener (2 min). Six total minutes that improve rib cage mechanics before any sustained aerobic effort. Particularly valuable before cycling or rowing, which are performed in a forward-flexed position that further compresses the anterior chest.
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COMING UP
Thursday expands the cardiovascular training picture with three Zone 2 formats — walking, cycling, and indoor rowing — with specific breathing protocols, and the 4x4 interval structure that research consistently supports for improving VO2 max in adults over 60.
Still moving forward,
— The SIM60 Team
simsixty.com · Educational content only. Not medical advice.
