A、Cut down the time of exercise programs. B、See a doctor before involving in exercise. C、Change our lifestyle or habit beforehan

I’ve been exercising regularly for a few years, with tremendous improvements in my health, and whenever someone asks me how they should start out in exercise,(16)I tell them just to get moving! Try to get moving every day—whether it’s walking, running, strength training, sports, running around with the kids, swimming, paddling, or whatever works for you. If you can do that, you’ll get healthier and fitter over time. And it does take time. Any exercise program that promises results in a week or three or even a month is either lying to you, or not worth it—you’ll just gain it back in a short amount of time, because you haven’t changed your lifestyle or habits. So you won’t see quick results if you get active, but you’ll see long-term results if you stick with it. However, people want specific programs. And while I’m not a certified trainer or an expert in any way, I have found some simple exercise programs that work for me and others I know, and can recommend them.(17)As always, if you have health problems and want to improve through exercise, consult a doctor before getting into any kind of exercise program. One last note: take it slowly.(18)Your body needs time to adapt to the exercise, and if you overdo it, you can injure yourself or burnout, and neither is good if you’re trying to stick with it long term. Progress gradually, in small steps, and you’ll stay injury-free and see great long-term results.
16. What does the speaker suggest exercise beginner do?
17. What does the speaker suggest if we have health problems and want to improve through exercise?
18. What may happen if we over-exercise?