Dumbbells are and will always be your most valuable tool at the gym. Being very versatile dumbbells allow for many variations, and this to a greater extent than machines.As you know exercises variation is of prime importance for growth, strength and longevity.Here 3 simple ways to instantly change the motor recruitment pattern of any dumbbellcurl exercise:Grip #1: Centered gripGrip #2: Offset grip, Pinkie on the plateLong biceps activationGrip #3: Offset grip, Thumb on the plateShort biceps activationTo know more, please visit http://www.strengthsensei.com/Follow us on Facebook: http://www.facebook.com/strengthsenseiFollow us on Twitter: https://twitter.com/StrengthSenseiFollow us on Instagram: @strengthsensei1