Circuit training is primarily a resistance-training workout. ... In contrast, interval training is a cardio workout. You choose your aerobic exercise -- swimming, running, cycling or rowing, for example, and perform intervals of high-intensity effort alternated with periods of recovery.
When a child is involved in a structured-play activity, they are learning how to recognise patterns and meet a pre-established goal in the most efficient or effective way. In contrast, unstructured play is about learning how to create from scratch and explore possibilities.
