This study looks at how imagining fast or slow muscle contractions affects young, healthy people’s muscle strength and brain activity. Muscle contractions are when your muscles tighten. Participants will imagine doing these contractions without moving their muscles. The study will have three parts: a rest period, imagining fast contractions, and imagining slow contractions. Before and after each part, doctors will check muscle strength and brain activity using a special test called transcranial magnetic stimulation (TMS), a method to measure brain responses.

• Participants will have 4 lab visits.
• No actual muscle movement is needed, just imagination.
• Eligibility: 18-30 years, healthy, and not on certain medications.

This study is for right-handed people who haven't exercised much recently and are free of upper body injuries. If you're eligible, consider if you're comfortable with the lab visits and tests. The study aims to understand if imagining fast muscle actions leads to better brain and muscle changes than imagining slow actions. Remember, this research could help in understanding muscle and brain functions better.