5x1K Interval Guide
[Free]

Black poster with concentric white lines forming a circle, and a white stylized hand holding a heart inside a circle in the center. Text includes '[5X1K] Shortcut to workout', 'Soul and Material Things', and 'Kokoro/Collective' with social media links and website.

A information guide about how to structure intervals and where to pay attention.

Containing essential info that actually supports performance, recovery, and long-term health.