Firehouse Innovations Training Corp. on Instagram: "This is a great idea for in-house Fire department drills. What we are doing here is spiking for what is normally the force you meet in the field by putting a light resistance in. Then we are showing you when hard resistance is encountered with an opening inward door with a wooden jamb with multiple locks. By putting a heavy resistance in instead of a light resistance we can simulate that scenario. Try this in your Firehouse with our multiforce