This study explores how **electrical stimulation** (using electrical currents to activate muscles) and **stepping practice** (walking exercises) affect connections between the brain and muscles. The aim is to design better rehabilitation (helping people recover) methods for older adults and people who had a stroke. Participants will take part in 1-5 sessions, each lasting up to 5 hours. During the sessions, participants will do walking exercises, sometimes with electrical stimulation to their leg muscles. Researchers will use noninvasive (not inside the body) techniques to measure brain and muscle connections. This study is for healthy individuals aged 18-65 who can walk a short distance. It aims to gather information that could help improve future treatments for people with walking difficulties.

• **Length**: 1-5 visits, each up to 5 hours.
• **Eligibility**: Healthy individuals aged 18-65 who can walk.
• **Risks**: No major risks, but some might find electrical stimulation uncomfortable.

Participants should not have any physical or neurological issues, be pregnant, or have other health conditions that could affect the study. This is a chance to contribute to research that could help others in the future!