Final answer:
Yoga is a multifaceted discipline that includes strength, flexibility, concentration, and breath control, aligning with the eight limbs of Yoga which guide practitioners toward physical, mental, and spiritual health.
Step-by-step explanation:
Yoga is an exercise that involves not only physical postures but also encompasses a holistic discipline which integrates moral codes, self-discipline, concentration, and breath control. Of the options provided, the one that most accurately describes this ancient practice is (3) Strength, flexibility, concentration, and breath control. This aligns with the eight limbs of Yoga, which include the observance of yamas and niyamas, asana (postures), pranayama (breath control), pratyahara (sense control), dharana (concentration), dhyana (meditation), and finally samadhi (oneness with the supreme soul).
These eight limbs guide practitioners through a journey that starts with ethical living and self-discipline, leads through physical postures and breathwork to prepare the body and mind, and culminates in deep meditation and enlightenment. Incorporating these practices supports not just physical wellbeing through flexibility exercises and strength, but contributes to mental and spiritual health as well. Thus, yoga is much more than just a flexibility exercise; it's a path to overall health and spiritual well-being.