This study examines how different frequencies (times per second) of **noninvasive spinal stimulation** affect spasticity (involuntary muscle movements), motor control, and pain in people with a **spinal cord injury (SCI)**. The stimulation is a gentle electrical pulse applied to the lower back and stomach. It aims to improve muscle strength and reduce spasticity without using drugs. Participants will need to visit the Shepherd Center 4 days a week for 2-3 hours each day, over 2-3 weeks.

• **Participation**: 4 days a week, 2-3 hours per visit, for 2-3 weeks.
• **Compensation**: Not mentioned.
• **Risks**: Must inform investigators of any changes in medication during the study.

To join, participants must be at least 16 years old, have had a spinal cord injury at least 3 months ago, and have some spasticity in their legs. They should not have worsening spinal issues, heart problems, or be pregnant. People with certain medical devices or ongoing infections cannot participate. The study aims to find the best frequency to help reduce spasticity without negative effects.