What Is the F4X Workout?
A neutral explanation of the Focus4 protocol and its three merchant-described phases.
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F4X is the merchant's shorthand for its “Focus4 Exercise Protocol.” Old School New Body presents the system through three phases.
LEAN, SHAPE and BUILD
LEAN is positioned around getting leaner; SHAPE around adding more lean muscle; BUILD toward a more muscular outcome. These are merchant descriptions, not guaranteed outcomes.
Health note: Exercise needs vary. If you have a chronic condition, disability, injury, or concerns about starting exercise, seek appropriate professional guidance.