The Jacobs Ladder is an exercise machine consisting of a runged ladder angled at 40 degrees. It is non-motorized, and thus self-paced.[1]
The machine was invented and patented by Steve Nichols in 1994.[2] Nichols had injured his knees and back and wanted to do a full-body workout that didn't put excessive stress on those injured body parts.[3]
5–10 minutes is considered a beginner duration, 10–20 for moderate, and 20–30 for an advanced level.[1] The Jacobs Ladder works out both the lower and upper body, and it is a favorite among groups such as United States Army Rangers, United States Navy SEALs, and The Biggest Loser contestants.[3] The main muscles activated in the exercise are the quads, glutes, shoulders, and lats.[4] Research from Louisiana State University has concluded that compared to a treadmill, the Jacobs Ladder allows a person to work out harder while expending less effort.[5] Due to the pressure applied on the inner abdominal muscles, the exercise is generally considered unsafe for pregnant women, especially after the 16th week of pregnancy.[6]
