This study explores how imagining fast or slow muscle contractions affects muscle and brain function. *Imagined contractions* means you'll think about moving muscles quickly or slowly without actually moving them. This helps us understand the *nervous system*, which includes your brain and nerves that control muscles. You'll participate in four lab visits. During these visits, you'll imagine muscle contractions and have your muscle and brain activity measured using a safe method called *transcranial magnetic stimulation* (TMS). This involves a device placed on your head to see how your brain responds to imagined movements.
Key Points:- Four lab visits with no actual physical movement needed.
- Focus on mental exercises to see how your brain and muscles react.
- No medications or special treatments involved.
Eligibility: You should be 18-30 years old, healthy, and not on certain medications. If you're female, you must have been on the same birth control for six months. You should also be right-handed and haven't engaged in structured exercise recently.