You're teaching an exercise class. You're leading the class in stretching. You want to tell them how to breathe.
Inhale... and exhale.
breathing, exercise, instructions, science 
You're having your first meeting with a personal trainer. You want to start lifting weights, but you don't want to get really big muscles. You say:
I don't want to get all bulked up; I just want to get toned.
You're exercising along with an exercise video at home. The teacher on the video is giving instructions for a stretching exercise. She says:
Kneel down on your hands and knees and arch your back.
It's a nice day outside, so you go out to ride your bicycle. You see your neighbor jogging and stop to make small talk with him. You talk about why you're riding your bicycle:
I just thought I'd come out and get some fresh air and sunshine.
conditionals, decision, exercise, outdoors, weather 
You haven't been exercising for a while, so you've gotten a little fat. Today you decide to go for a jog. You run into one of your neighbors. You say "hi" to him and then explain why you're exercising:
I've got to work off this beer belly!
You bought a helmet and pads to wear while riding your bicycle. Now you're looking at yourself wearing them in the mirror, and you don't like how it looks. You think to yourself:
I look like a dork.
clothing, cool, exercise, nerd, reflection You're going for a run with a friend of yours who's a strong runner. He's running to fast, and you don't think you'll be able to continue running that fast for the entire time. You say:
I don't think I can keep up this pace.
You're writing a blog post about how you think America should solve the problem of having too many overweight people. You just wrote that obesity has increased over the last 20 years. Now you want to explain why you think the number of fat people has increased You write:
This rise in obesity is due to poor diet and lack of exercise.
You are a really physically fit person who works out at a gym several times a week. Your friend is complaining that she's been lifting weights but her muscles haven't gotten any bigger. You think that she just needs to continue doing it for longer. You say:
You know, building muscle takes time.
You have been exercising for 3 months to try to lose weight, but you haven't lost much weight. You're telling someone about this problem. You say:
I'm not seeing any results.
