Does her order call for a habit? Not all the founders of religious orders called for a habit in their constitutions (I was not aware of this until recently, Brother JReducation pointed this out in another thread).
I’m not sure nuns should be doing this sort of thing. Certainly, the body is the temple of the Holy Spirit and should be cared for as such, via nutrition and exercise, but I think our society is currently caught up far too much in body image, competition, etc.
Malleus: From the Council of Trent:
The Council of Trent
The Twenty-Fifth Session
The canons and decrees of the sacred
and oecumenical Council of Trent,
Begun on the third, and terminated on the fourth, day of December, MDLXIII., being the ninth and last under the Sovereign Pontiff, Pius IV.
ON REGULARS AND NUNS
The same sacred and holy Synod, prosecuting the subject of reformation, has thought fit that the things following be ordained.
[Page 237]
CHAPTER I.
All ReguIars shall order their lives in accordance with what is prescribed by the rule which they have professed; Superiors shall sedulously provide that this be done.
Forasmuch as the holy Synod is not ignorant how much splendour and utility accrue to the Church of God, from monasteries piously instituted and rightly administered; It has,–to the end that the ancient and regular discipline may be the more easily and promptly restored, where it has fallen away, and may be the more firmly maintained, where it has been preserved,–thought it necessary to enjoin, as by this decree It doth enjoin, that all Regulars, as well men, as women, shall order and regulate their lives in accordance with the requirements of the rule which they have professed; and above all that they shall faithfully observe whatsoever belongs to the perfection of their profession, such as the vows of obedience, poverty, and chastity, as also all other vows and precepts that may be peculiar to any rule or order, respectively appertaining to the essential character of each, and which regard the observance of a common mode of living, food, and dress. And all care and diligence shall be used by the Superiors, both in the general and in the provincial Chapters, and in their visitations, which they shall not omit to make in their proper seasons, that these things be not departed from; it being certain, that those things which belong to the substance of a regular life cannot be by them relaxed. For if those things which are the basis and the foundation of all regular discipline be not strictly preserved, the whole edifice must needs fall.