The frog rig gets its name because the person ascending has to crouch like a frog for each repitition. Basically the frog rig works by allowing you to put your weight on one mechanical ascender while you slide the other ascender up the rope. Then you transfer your weight to the second ascender and slide the first ascender up. The frog rig lets you use your legs for the lifting and your arms for the balance.
Setup:
Use a carabiner to attach a chest ascender to your harness as low as you possibly can (i.e. through the tie-in loops, not the belay loop).
Attach the upper hole of the chest ascender to an adjustable loop around your neck. This will keep the chest ascender vertical so it slides up the rope.
Connect the chest ascender to the rope.
Connect the hand ascender to the rope above the chest ascender.
Attach a piece of rope or webbing from the hand ascender to your harness. This acts as a safety backup.
Attach a piece of rope or webbing with a footloop to your hand ascender.
Sit down so the chest ascender is holding your weight.
Tighten the neck loop as tight as you comfortably can.
The Ascending Steps
Sit down so the chest ascender is holding your weight.
Slide the hand ascender up as high as you can reach while silmultaneously lifting your legs up into a crouched (frog) position.
Transfer your weight to the hand ascender by standing up in the leg loops. Use your hands for balance, not for doing pull-ups.
As you stand up, your chest ascender should automatically slide up the rope. When you're close to the ground, you may need to pinch the rope between your feet to keep it from getting lifted up with you.
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