Step 1: Analyze Assertion [As].
The Assertion states that the National Education Policy 2020 (NEP 2020) recommends Yoga education as a means to promote holistic development and well-being. The NEP 2020 indeed emphasizes a holistic approach to education, including physical education, well-being, and the integration of traditional Indian knowledge systems like Yog(A) Yoga is widely recognized for its benefits across physical, mental, emotional, and spiritual dimensions, contributing to overall well-being and holistic development. Therefore, Assertion [As] is TRUE.
Step 2: Analyze Reason [R].
The Reason states that "Yoga education focuses \textit{only} on physical postures (asanas) and breathing techniques." This statement is incorrect because it uses the limiting word "only." While asanas (physical postures) and pranayama (breathing techniques) are important components of Yoga, Yoga is a much broader discipline. Traditional Yoga encompasses several other aspects, including:
Yamas and Niyamas: Ethical principles and self-restraints.
Dharana (Concentration): Focusing the mind on a single point.
Dhyana (Meditation): Sustained concentration leading to a state of contemplation.
Samadhi: A state of profound meditation or spiritual absorption.
It also includes elements like chanting, mudras, bandhas, and a philosophical framework aimed at mental clarity, emotional balance, and spiritual growth. Therefore, stating that Yoga education focuses \textit{only} on asanas and breathing techniques is a narrow and inaccurate description. Thus, Reason [R] is FALSE.
Step 3: Combine the findings for Assertion and Reason.
Assertion [As] is True.
Reason [R] is False.
Step 4: Choose the correct option.
Based on the analysis, the option that states [As] is true but [R] is false is the correct choice.
The final answer is $\boxed{\text{[As] is true, but [R] is false}}$.