“Introduced in the Scandinavian countries in the 1960s and 1970s, interval-circuit training combines interval training and circuit training into one workout.” (Kenney, Wilmore & Costill, 2012, p.223).
The circuit may be 3,000 to 10,000 metres in length, with stations every 400 to 1,600 metres (437-1,750 yards). The individual jogs, runs, or sprints the distance between stations; stops at each station to perform a strength, flexibility, or muscular endurance exercise in a manner similar to that in actual circuit training; and continues on, jogging, running, or sprinting to the next station. Trim Trails are very similar.
These courses are typically located in parks or in the country where there are many trees and hills. Such a training regimen can benefit almost any type of individual and provide diversity to what might be an otherwise monotonous training regimen.
Kenney, W.L., Wilmore, J.H. & Costill, D.L. (2012) Physiology of Sport and Exercise. 5th Ed. Leeds: Human Kinetics.