Yōga Sūtra 2.43

कायेन्द्रियसिद्धिरशुद्धिक्षयात्तपसः।

kāyēndriyasiddhiraśuddhikṣayāttapasaḥ।

[काय इन्द्रिय सिद्धिः अशुद्धिः क्षयात् तपसः।
kāya = the body; indriya = senses; siddhiḥ = mastery; aśuddhiḥ = impurities; kṣayāt = reduction of; tapasaḥ = the practice;]

The practice results in a reduction of impurities and mastery over body and senses.