Now as these be generall staies not to proceede further, but to rest when we are well: so there be other more particuler, wherein there is regard to be had, to the _strength_ or _weakenes_ of the partie, to the _age_, to the _time_ of the yeare, to the _temperature_ of the body, to the _kinde_ of life. For in all these measure is a mery meane, and immoderatenes a remeadilesse harme.
They that be of good _strength_ may continue longer in exercise, then any other, without some great occasion to the contrary: though they faint, and feele some litle _lassitude_ and _wearines_, bycause they will quickly recouer themselues. Those that be but _weake_ must exercise but a while, bycause any small taint in them, is long and hard to be recouered, and therefore their limit is to be warme, and to be ware of sweating.
2. As touching the difference in age. Olde men, yea though they vse the same exercises, wherewith they were acquainted when they were yong, yet must leaue ear they either sweat or begin to be wearie, bycause they are drye and wythered. Men of middle _age_ must of necessitie keepe the meane lymit, bycause too much offendes them, to litle doth them litle good, both hinder the state of their bodies. _Youth_ from seuen till one and twenty, will abyde much exercising, very well: wherefore they are allowed without daunger to be hoat and chafe, to puffe and blow, to sweat, to be wearie also to some degree of _lassitude_: for being full of excrementes by reason of ther reacheles diet, they finde great ease in labour and sweat: and being strong withall, a litle _wearines_ makes them litle worse. And yet there must be great eye had to them, that they keepe within compasse, and so much the more, the lesse they be aboue seuen yeare old. For too much exercise in those yeares marres their growing, and alters the constitution of their bodies to the worse.
3. For the _time_ of the yeare. In _Winter_ the exercise may be great, till the body be hotte: but yet sweat not, lest the cold do harme. In the _Spring_ more euen till it sweat, in the _Haruest_ lesse, in the _Sommer_ least: because the ayre which enuironeth the body, doth then of it selfe so wearie and weaken it, as it needeth neither sweating, nor heating, nor wearying with exercise, wherein _Hippocrates_ and his _Phisicke_ will preuaile against _Aristotle_ and his _Philosophie_.