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I suggest reading "Physical aspects of fitness":
according to which the different aspects of fitness are CRE (Cardio-Respiratory Endurance) / Aerobic Endurance, Muscular Endurance, Strength, Speed, Power, Flexibility.
With so many exercises to choose from, how do you know which ones live up to the hype and which ones may not be worth your time? We asked some of the top trainers in the country to share which unsafe and ineffective exercises they think most people can do without, and the more effective replacement moves they feel will better equip you to reach your fitness goals.