Optimize: Breathing & Lungs

The best-evidenced self-directed breathing lever. Breathing exercises (mostly yoga breathing) improved asthma quality of life ~0.42 on the AQLQ across trials; adding Bhramari pranayama left 68% of children controlled vs 39%; in a 43-trial COPD network meta-analysis yoga breathing ranked highest for quality of life. Free, teachable. Key limit: it improves symptoms and quality of life, not lung function (FEV1); see overGradedTiers.

NAC 600 mg twice daily cut COPD exacerbations ~22% over a year (PANTHEON, Zheng 2014, PMID 24904996), best in more symptomatic patients. Honest pairing: at 600 mg once daily it did NOT slow lung-function decline over three years, so it is an exacerbation-reducer, not a disease-modifier. Cheap, well-tolerated.

In COPD, tai chi added ~98 feet (30 m) to a six-minute walk, a clinically meaningful gain, while training breath control, posture and gentle exertion. A good accessible on-ramp to pulmonary-rehab-style exercise (see completeness).

Baduanjin ranked top for FEV1 lung function among Chinese exercises in stable COPD (a network-meta ranking, so treat the ranking cautiously; see overGradedTiers). Gentle, standardized eight-movement set, easy to learn.