The Compendium of Caraka 4.8.38_2

4.8.38_2

dāruṇavyāyāmavarjanaṃ hi garbhiṇyāḥ satatamupadiśyate, viśeṣataśca prajananakāle pracalitasarvadhātudoṣāyāḥ sukumāryā nāryā musalavyāyāmasamīrito vāyurantaraṃ labdhvā prāṇān hiṃsyāt, duṣpratīkāratamā hi tasmin kāle viśeṣeṇa bhavati garbhiṇī; tasmānmusalagrahaṇaṃ parihāryamṛṣayo manyante, jṛmbhaṇaṃ caṅkramaṇaṃ ca punaranuṣṭheyamiti /

For avoiding violent physical exercise is always advised for a pregnant woman, and especially at the time of delivery, when all bodily constituents and humors are agitated, wind stirred up by the exertion of a pestle might, finding an opening in the delicate woman, harm the vital breaths; for a pregnant woman is especially difficult to treat at that time. Therefore, the seers hold that grasping a pestle is to be avoided, but yawning and strolling are indeed to be performed.