Hello, Both of them are definitely suffering from persistent rhinitis/rhinosinusitis that is a risk factor for development of asthma. Montelukast is a good choice for the lung and for exercise induced asthma but allergy testing is required to ensure you are aware of exactly the allergens your kids are sensitized to, example house dust mite or animal dander or molds. Precaution works a long way in preveting exacerbating allergies and long acting non sedating antihistamines plus nasal corticosteroids prevent ongoing nasal inflammation and subsequent asthma. Thanks.