Recovery index

Rest, sleep and recovery. Adaptation happens during recovery, not during the run, and the cheapest tools (sleep, subjective monitoring) often beat the expensive ones.

• Sleep — the highest-leverage recovery tool there is
• Napping — a daytime nap recovers part of a lost night and lifts alertness, but supplements rather than replaces night sleep
• Supercompensation and adaptation — why recovery drives fitness; the textbook curve is oversimplified
• Overtraining and overreaching — the continuum, and why it is only confirmed in hindsight
• Delayed onset muscle soreness (DOMS) — what next-day soreness is, the repeated-bout effect, and why no gadget removes it
• Recovery modalities — an evidence-graded tour of the recovery industry
• Cold water immersion — real relief, but it blunts adaptation
• Stretching and mobility — does not prevent overuse injury; more flexibility is not better
• Foam rolling and mobility tools — cheap, harmless, mostly perceptual
• Massage — feels good and eases perceived soreness; little measurable recovery benefit
• Massage guns — short-term range of motion and feel, little real recovery benefit
• Compression boots — modest perceived-soreness relief, no better than a compression garment
• Active recovery and recovery runs — easy movement over the lactate-clearance myth
• Sauna — thin recovery evidence; distinct from heat acclimation
• Stress and life load — non-training stress impairs recovery and raises injury risk
• Travel and jet lag — circadian disruption and how to blunt it
• Training monitoring — subjective wellness beats most gadgets
• Deload and rest — sound practice, thin trial support
• Detraining — how fast fitness is lost with time off
• Blood-flow-restriction training — rebuilding muscle at light loads when an injured limb cannot take heavy lifting