Breathing exercises for people with asthma

As someone with chronic asthma, I'd love to know if there's any exercise that helps me control my breathing. Are there any breathing exercises that work for someone like me? If so, how should I start?

Answer:
Dr. Dan Rutherford: You are probably referring to the Buteyko breathing technique (BBT). This is a method of "retraining" breathing according to a system developed in the 15th century by the famous Ukrainian physiologist. Buteyko has helped many diseases related to breathing, including asthma because this technique focuses on breathing exercises, holding the breath.
BBT is not a cure-all but many people find the technique helpful in reducing their symptom severity and frequency of medication use, which improves bronchospasm.
Although many Buteyko “fans” claim it to be effective, the reality is that there is little evidence.
Dr Tony Gallagher: For some people, asthma symptoms are mild and infrequent. And I hope you are in this group. In others, every day can be a struggle, and in rare cases, asthma can be life-threatening.
Most patients can still participate in any activity they want as long as their disease is under control. There are many famous asthma patients, including David Beckham and athlete Paula Radcliffe, who lead an active life.
If it is true that exercise can cause asthma attacks, there are ways to prevent them too. If exercise triggers an asthma attack, use the inhaler immediately before you warm up to exercise, especially in a cold, dry environment.
You should aim to exercise 30 minutes/time, 3-5 times/week at a moderate level of exertion (moderate breathing). Rosemary Conley, a guru coach and asthma patient, says that starting with a 5-minute walk three times a day is enough to make a difference. Yoga also provides the body and mind with poses performed in harmony with breathing techniques.
Nhan Ha
According to telegraph