When you add weights to your workouts, you're performing strength training. Strength training isolates a muscle and works it repetitively in a focused manner to make it stronger. By directing the intensity of your workout to a specific muscle group, you develop these muscles' ability to work together longer before fatigue sets in.
Strong muscles take you that extra mile when you think you've got nothing left. They help you slice through choppy waters or climb a hill. And strong muscles help you maintain your form for efficiency. Improving your core strength (your abdominal and back muscles) prevents muscle fatigue during long workouts that can cause you to slouch into poor form. Maintaining proper form throughout your workouts keeps your swimming, cycling, and running efficient and reduces your chance of injury.
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Fit exercise into your busy schedule? Thats as absurd as saying that there are eight days in a week! First, youve never exercised before or engaged regularly in a sport second, youve never been into the fitness crowd and have had meager time for such pursuits, and third, youre far too busy to even think of exercise.