Progress slowly in your practice if you are aware of an internal weakness. Just as a beginning runner can damage her knees running a marathon in the first week of training, a beginning qigong practitioner can injure weak organ training too strenuously. Avoid personal comparisons. Everyone progresses at a different pace. Keep your mind centered on your own issues.
Comparisons only feed the emotional monkey mind.
Eat a healthy diet. Traditionally, qigong practitioners believe that proper diet is the most important key to a healthy life. Avoid too much greasy and sweet food. Limit fast food and alcohol. Don't worry about missed a few classes.