Each type of muscular strength must be trained for optimum TestoEdge 20 performance under any circumstance.Fitness is a compromise between the physical abilities of cardiorespiratory endurance, strength, power, speed, flexibility, balance, coordination, agility, accuracy and toughness... and muscular strength is a compromise between maximum strength, power and strength endurance.Maximum StrengthMaximum strength is how much force can be generated by the muscles and skeletal system for one, all-out effort.