For example, an eight station circuit could begin with a high space and, from there, move to medium, low, medium, high, medium, low, medium. If groups of students are starting at various stations, this should be no problem. If the circuit is designed properly, at no time will any student be moving immediately from high to low or low to high without working at a medium station first. Understand the purpose of the circuit. If, for example, the purpose is to develop cardiorespiratory endurance, then the fitness principles for this parameter must be met.
Strength is developed in other ways.
It is important that teachers understand what each of these means and how each component is developed. There are books listed in the bibliography that may be of help. This information is also available in most libraries. Before the circuit begins, a proper warmup is critical, as is a cooldown at the conclusion of the workout. Allow students unrestricted access to water during the workout.