To understand the importance of increasing physical fitness. you must first understand the components of physical fitness.
Body composition: Body composition is the ratio of water, bone, muscle, and fat in the body.
Cardiorespiratory endurance: Cardiorespiratory endurance is measuring one’s maximal oxygen uptake (or rate of oxygen consumption) during exercise (typically cardiovascular exercise). This is how efficiently your body takes in, transports, and uses oxygen while exercising. Having efficient heart and lungs leads to increased energy throughout the day.
Muscular strength: Muscular strength is the maximum amount of force a muscle can produce in a single effort or how much you can lift in one attempt.
Muscular Endurance: Muscular endurance is your ability to contract your muscles several times without excessive fatigue.
Flexibility: One of the more overlooked components of physical fitness, flexibility determines your range of motion. Being able to move without unnecessary encumbrance is key to physical fitness as it will determine your fitness ceiling.