What is Strength training? A type of exercise that uses resistance to improve the endurance, size, and strength of your muscles. Training that helps you breath during running Jumping jacks A 5K

## Step 1<br />The question is asking for the definition of strength training. Strength training, also known as resistance training, is a type of physical exercise that improves muscular strength and endurance. This is achieved by exercising a specific muscle or muscle group against external resistance, such as weights or resistance bands.<br />## Step 2<br />The other options provided, such as training that helps you breathe during running, jumping jacks, and a 5K, are not accurate definitions of strength training. They are different types of exercises that focus on different aspects of physical fitness.<br />## Step 3<br />Breathing training is a type of exercise that focuses on improving lung capacity and breathing efficiency. Jumping jacks are a type of cardio exercise that involves jumping and spreading the legs. A 5K is a type of race, specifically a 5-kilometer race, which is a form of cardio exercise.