Portable Design: Compact muscle trainer measuring 10*5cm; Conveniently fits into your daily routine for on-the-go workouts; Enhance muscle strength and flexibility anytime, anywhere. Adjustable Resistance Levels: Customizable rotary valve for tailored muscle training; Easily adjust resistance intensity by rotating left or right; Optimize your workout with personalized settings for effective results. Versatile Training Tool: Ideal for various sports activities including track and field, running, swimming, gymnastics, martial arts; Enhance performance and endurance across different disciplines. Premium Silicone Material: Crafted from ultra-flexible food-grade silicone; Ensures safety and durability during muscle training process; Easy to clean and maintain for long-lasting use. Safe and Effective Muscle Training: Individually packaged for hygiene and safety; Comprehensive muscle training suitable for diverse users; Achieve optimal fitness levels with this high-quality breathing trainer. Improve your muscle strength and endurance with this versatile breathing trainer. Crafted from ultra-flexible silicone, this trainer offers a safe and high-quality muscle training experience. The adjustable resistance feature allows you to customize the intensity by simply rotating the valve. Its compact and portable design, measuring 10*5cm, ensures you can conveniently incorporate muscle training into your daily routine, no matter where you are. Individually packaged for cleanliness, this trainer is a must-have for sports enthusiasts engaging in activities like track and field, running, swimming, gymnastics, martial arts, and outdoor adventures. Item Name: Breathing Trainer Material: Food Grade Silicone, APS Applicable Scenarios: Running Sports, Fitness Equipment, Health Massage, Fitness And Beauty, Others Features: Men Women Universal, Portable Size, Workout Equipment Size Details: L: 10cm, W: 5cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Breathing Trainer