Front Box Jump | Anatomical Analysis Plyometrics, also known as jump training or plyos, are exercises in which muscles exert maximum force in short intervals of time, with the goal of increasing power. Explosive strength is defined as the rate of force development (RFD) at the onset of contraction. Instructions: Swing your arms back behind sides while squatting down partially. Rapidly swing arms forward and jump onto the box. Both feet should land on the box simultaneously. The front box jump im