It can be started slowly (try using a treadmill to moderate your pace) and built up as you feel comfortable. It will help open your airways and make breathing a bit smoother. It will strengthen your lungs and help improve on your breathing and reduce your asthma symptoms. Asthma patients' lungs are more sensitive to cold air or hot air and pollen and other things from the atmosphere.
In 2007, Circulation, the journal of the American Heart Association, published an updated report on physical activity and public health. In order to make a recommendation on the amount of exercise necessary to benefit America's health, an expert panel of scientists, including physicians, epidemiologists, exercise scientists, and public-health specialists reviewed research on physical activity and the impact of exercise on health.
As you get fit, you burn less calories doing the exact same workout. Shift your walking workout into a higher gear by doing interval training. Start at a warmup pace for a couple minutes and then walk at a brisk pace. Every five minutes, increase your pace to a sprint level, either by speed-walking, running or skipping rope. Maintain this burst of speed for 30 seconds. Return to a slow walk for a minute and then back to your vigorous pace before the next sprint. You dramatically boost your heart rate during the sprints, and it stays raised during the recovery period, resulting in more calories burned.
There's some good news for people undergoing cancer treatment. In one study, aerobic exercise performed five days per week for 30-35 minutes for six weeks at 80% of maximal heart rate reduced fatigue in women being treated for cancer. In another study, 10 weeks of aerobic exercise at 60% of maximum heart rate for 30-40 minutes, four days per week, reduced depression and anxiety in female cancer patients. Aerobic exercise isn't a panacea when it comes to cancer, but evidence suggests that it certainly can help.
To achieve a training response, athletes should exercise 3 to 5 times per week for at least 20 to 60 minutes. Fitness level can be improved with as little as 10 minutes of exercise if done 2 to 3 times per day. If the goal is also to lose body fat, athletes should exercise for at least 30 to 60 minutes. Athletes who are not fit will need to start with lesser amounts of exercise. They can slowly add more time as their endurance improves. Increasing the level of exercise at about 10% per week is a good goal to prevent overuse injury.
Vary your walking workout to keep it interesting and you will also burn more calories. Incorporate a couple of inclines into your walking route. If you exercise on a treadmill, set it at a slope for part of the time. Walking more extreme inclines makes your workout more like hiking, which burns twice the amount of calories than walking on a flat route.

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