Yoga Sūtra Chapter Two verse 43

कायेन्द्रियसिद्धिरशुद्धिक्षयात् तपसः ॥४३॥

kāya-indriya-siddhiḥ aśuddhi-kṣayāt-tapasaḥ ||43||

From self-discipline, impurities diminish
and accomplishment in the body and senses.

kāya - the bodyindriya - faculty of sense; sense; organ of sense; organs of motor action and sensory perceptionsiddhi - accomplishment, performance, fulfilment, attainment, success; the hitting of a mark; coming into force, validity; any unusual skill or faculty or capability; the acquisition of supernatural powers by magical means or the faculty so acquiredaśuddhi - impuritykṣaya - diminish, wasting or wearing awaytapas - to heat; religious austerity; self-discipline; pain, suffering
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Commentaries and Reflections

Commentary by T Krishnamacharya:

Tapas
– Good, limited food
– The ability to listen
– Sharpening the senses
– Building resistance to Dvaṃdva

Commentary by TKV Desikachar:

“The Siddhi depends on the Bhāvanam.”

Commentary by S Ramaswami:

“The types of perfection are dealt with in III. 45. Both of body and senses.
The Tapas here again refers to limitation rather than mortification etc…limitation of food, speech, etc.
Then the body and the senses become very sharp.
Also both health and strength are gained.”