【Item with Reason】Water Dumbbell Muscle Training 20kg With Instructions & Air Pump Standard Retail Price: ¥5,680 ⇒ ¥3,480 Easy-to-handle size. Popular with beginners and women. * Instruction Manual included * Free Shipping! #Gensan's Listings 【Item with Reason】 The blue coloring from the water used during the photoshoot has left a stain. There is no problem with use, but please refrain from purchasing if you are concerned. ※ The stain will probably come off after changing the water a few times. First-time Water Bag (Water Dumbbell) ＜Core Strength Check Method＞ From a standing position with both hands on your waist, lift one leg to 90 degrees and hold for 20 seconds. Check how much your body sways. If you can't keep your upper body straight and your body sways, or if your balance is off and the supporting leg on the floor slides, your core is weak. "What is Core Training?" Training your core allows your body to learn the correct movements. You'll develop a strong, unwavering body, which is effective in sports and daily life. Tuning your body: Correcting + Training = Tuning your body. Effective for exercise, training, those looking to eliminate lack of exercise, and for dieting. "Get a Beautiful Body at Home" Using a water bag stimulates the muscles in the center of your body, allowing your body to learn the correct movements, become strong and unwavering, become less tired, achieve a lean physique, tighten your abdomen, achieve the correct form, get a toned stomach, and lead to a toned, ideal "beautiful body." "With Instructions, Let's Try It First." A user manual (instructions) is included to create a "beautiful body" at home in as little as 21 days! Balance your whole body's muscles and get a functional body with less fat.