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1. Deltoids. Deltoids are a fancy term for "shoulder muscles." "The deltoids are located at the top of the arm and cover the shoulder joint," Julom explains. "When doing jumping jacks, the arms ...
Schoolchildren in the US performing jumping jacks. A jumping jack, also known as a star jump and called a side-straddle hop in the US military, is a physical jumping exercise performed by jumping to a position with the legs spread wide and the hands going overhead, sometimes in a clap, and then returning to a position with the feet together and the arms at the sides.
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 (speed-strength). This training focuses on learning to move from a muscle extension to a contraction in a rapid or "explosive" manner, such as in specialized repeated jumping. [1]
Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has an effect on what fuel the body uses and what kind of adaptations the body makes after exercise. Intensity is the amount of physical power (expressed as a percentage of the maximal oxygen ...
Jumping jacks mix cardio and resistance work in one swift move (er, jump), while engaging multiple muscles, including the glutes, hamstrings, quads, and calves, as well as the muscles of the core ...
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The impetus for the style of physical testing that developed into the Presidential Fitness Test was a research study conducted by Dr. Hans Kraus and Dr. Sonya Weber in the early 1950s. The study, originally connected to their research in lower back pain, resulted in a diagnostic test for muscular fitness called the "Minimum Muscular Fitness ...
Patellar reflex. Schematic representation of patellar tendon reflex (knee jerk) pathway. The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have the patellar reflex, including dogs, cats, horses ...