Spoiler alert: It involved Day-Glo workout gear.
Fallon and Johnson donned wigs, blindingly white sneakers and some vintage late '80s/early '90s workout gear to portray the fictional Fungo Brothers, whose workout routine Johnson credited with helping him get in shape.
One look at the pair's routine, which involves Thighmasters and Shake Weights, reveals that Johnson didn't use anything approaching this routine to get in Herculean shape. Rather, the star told Today that he ate seven to eight meals a day and worked out twice a day – a routine that started at 3:30 a.m.
If you're interested in checking out the fruits of Johnson's labors, Hercules hits theaters July 25.
Courtesy Dwayne Johnson