A blood flow restriction (BFR) exercise strap. The strap is configured with a coupling at a first end of an elastic band. A second free end of the band is releasably retained in the coupling by a lever arm that is biased in a closed configuration against a plurality of teeth carried on an interior surface of the base. The band has graduated indicia carried thereon for determining a constriction level applied by the band to a limb of the user. The graduated indicia allow the user to set a desired level of constriction on each of a left limb and a right limb to provide the user to develop bilateral symmetry of targeted muscle groups of the limbs.