Qualifying exigency leave, like leave for a serious health condition, is a FMLA-qualifying reason for which an eligible employee may use his or her entitlement for up to 12 workweeks of FMLA leave each year.
Considerations. You can change your calorie intake during training if you feel it is necessary. If you're gaining weight, try eating 200 calories less per day. Likewise, if your training is suffering and you lack energy, you're probably not eating enough, so add in an extra 200 calories each day.
Activity Levels. Once you have your BMR, you can tailor your calorie intake to your needs. In training for a half marathon, you're going to need extra calories above your BMR to fuel your training. Use the Harris Benedict Equation to do this.