We are conducting a research study to understand how muscle growth processes work differently in lean individuals compared to those with obesity. We are looking for participants aged 18-45 years old. You need to have a stable weight and meet the UK physical activity guidelines. Unfortunately, if you have certain conditions like diabetes, kidney disease, or if you are pregnant, you cannot join. You will do a one-time exercise session and drink a protein shake. Muscle and blood samples will be taken to study muscle reactions. The study involves one visit lasting around 3-4 hours.

• **Age Requirement**: 18-45 years.
• **Time Commitment**: 1 visit, lasting around 3-4 hours.
• **Exclusions**: Certain health conditions, medications, and dietary restrictions.