<unk>  is a process whereby the heart and lungs are trained to pump blood more efficiently, allowing more oxygen to be delivered to muscles and organs.<unk>  is the use of continuous, rhythmic movement of large muscle groups to strengthen the heart and lungs (cardiovascular system). Improvement in<unk>  occurs when athletes expose themselves to an increase in oxygen uptake and metabolism, but to keep this level of<unk> , the athletes must keep or progressively increase their training to increase their<unk> .<unk>  condition is usually achieved through cardiovascular exercise such as running, swimming,<unk> s, etc. A stronger heart does not pump more blood by beating faster but by beating more efficiently. Trained endurance athletes can have resting heart rates as low as the reported 28 beats per minute in people such as Miguel Indurain or 32 beats per minute of Lance Armstrong, both of whom were professional cyclists at the highest level.
Aerobic conditioning
Counterstimulation
Neurostimulation
Autogenic training
Desensitization 
Co-stimulation
Spaced repetition
Postural restoration