Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to work out quietly [title] Focus on your breathing. [step] No one likes being next that guy at the gym-either on the treadmill or in the weight room-who seems to be over-exaggerated his breathing. Intense huffing and puffing can be distracting to others, so focus on how you're breathing to control and regulate your breath.

Ending1: [substeps] Breathing deeply is particularly important for people with asthma who are exercising quietly. When your lungs are full of air, you become irritable and eventually may feel lightheaded (too much oxygen can have a negative impact on your circulation). Ending2: [substeps] Lift a hand to your mouth and exhale deeply. Next, release your hand and repeat this 10 times. Ending3: [substeps] Focusing on your breath will help bring your attention to the sound, depth and rate of your breathing. This can help keep you a little more quiet, but may even improve your workouts. Ending4: Pay special attention to lifting your head, chest, neck, and the backs of your thighs. You should gently imagine you're breathing in through the nose.

Answer format: ending1/ending2/ending3/ending4