The Hammer Strength unilateral supinated-grip pulldown is one of my favorite machines. It's nearly impossible to duplicate with free weights what this machine can do.
Several training methods work great on this machine, like maximum tension alternating pulls (hold one side isometrically in the contracted position at the bottom while the other side is moving). It also works great with bands for added accommodating resistance.
The farmer's walk is as old school as it gets – just grab a pair of heavy weights and walk! But with just a few technical tweaks, you can take the farmer's walk to the next level of safety and effectiveness.