Making training specific to the sport being played/movements used/muscles
used/energy system(s) used.

Swedish for ‘speed play’. Periods of fast work with intermittent periods of slower work. Often used in running, ie sprint, jog, walk, jog, sprint, etc.

Delayed onset of muscle soreness (DOMS). The pain felt in the muscles the day after exercise.

High intensity exercise involving explosive movements. The muscle is lengthened and then rapidly shortened to develop the explosive capability of the muscle.

It’s an exercise strategy alternating periods of short intense anaerobic exercise with less intense recovery periods