Study Overview: This study explores how different phases of the menstrual cycle affect hunger and eating habits after exercise. It involves young women participating in four sessions: during the follicular phase (the first part of the menstrual cycle) and the luteal phase (the second part of the cycle), both with and without exercise. Researchers will measure how hungry participants feel, levels of appetite hormones, food choices, and other markers like lactate (a substance made in muscles during exercise), estradiol, and progesterone (hormones involved in the menstrual cycle), and how much energy they consume.

Eligibility: Participants should be healthy females aged 20-30 with regular periods and stable weight for the last six months. Women who are overweight, have high blood pressure, or suffer from chronic diseases like heart disease or cancer cannot participate.

• There will be four sessions, two with exercise and two without.
• Researchers will study how exercise during different menstrual phases affects hunger and food choices.
• Participants should not have certain health conditions to be eligible.