Run in place while lifting your knees to the level of your waist. Engage your abs as the knee comes up. Pump your arms to warm up your upper body.
The 6 Best Quad Stretches to Build Strength and Flexibility - GoodRx
10 Best Exercises For Lower Back Pain, According To A Trainer
Gastrocnemius Muscle Stretch: Improve Flexibility with these Advanced Stretches
6 Best Calf Stretches - How to Stretch Your Calves
Stretching Suggestions for the Morbidly Obese
Lower-Body Stretches: Warmup and Cooldown Stretches for Your Legs
Calf Stretches - Active Chiropractic
How to Be More Flexible: 30 Tips, Stretches, Exercises, and More
How to Stretch the Knee: 6 Stretches and Other Tips