तत्र स्थितौ यत्नोऽभ्यासः ॥१३॥
tatra sthitau yatno-'bhyāsaḥ ||13||

[RS] 1.13 Assiduousness means resolutely adhering to one’s practice of yoga.

[JW] 1.13 Practice (abhydsa) is [repeated] exertion to the end that [the mind] stuff shall have permanence in this [restricted state].

[SS] 1.13 Of these two, effort toward steadiness of mind is practice. [p19]

[TD] 1.13 Practice is basically the correct  effort required to move toward, reach, and maintain the state of Yoga. [p154]

[EB] 1.13 From these, practice is the effort to be fixed in concentrating the mind. [p48]

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(तत्र, tatra) = here; there; so that
(स्थितौ, sthitau) = resolutely; continuously; constantly;
(यत्न, yatna) = effort; practice
(अभ्यासः, abhyāsaḥ) = cheerfulness; assiduousness