Big fizzing electrical arcs are fun, and handled properly, not too dangerous either. The Jacob’s Ladder is one such piece ... with a basic high-voltage step-up kit that turns 4V DC into 15 ...

A ladder is a set of steps with a pole on each side. The purpose of a ladder is to reach high places and points safely. It is believed that the idea of a ladder was used over 10,000 years ago.

You’ve found it. This two-move session lasts just 20 minutes but uses a ‘ladder’ protocol to ensure you’re working right on the edge of your limits throughout – pushing close to failure ...