Singulair has been reported to be effective in asthma control. Breathing exercises have also been proven to keep asthma in check. Your case has proven the efficacy of both approaches. What you are enjoying right now could be the effect of two consecutive approaches that are effective. Mild-to-moderate asthma can improve over time, and in some cases, adults can experience a period of remission. Improvements have been reported even in some severe cases depending on the timeliness and effectiveness of treatment. While there used to be only anecdotal evidence of breathing exercise efficacy, a 2008 study in Australia found that regular breathing exercise reduced the use of asthma prevention and relief medications by 50 and 86 percent, respectively. You may continue your breathing exercises if this has improved your quality of life as long as you are also prepared with a medication prescribed by your doctor in case of asthma attack.