Not very stable even for a 12 year old. We first used this on a windless day to add some resistance on short sprints, it didn't add much. We then used it in winds of around 5mph and it seemed to work pretty well. If you are a good runner or an adult you might want to look at something with a large parachute or double parachute.
NIGHTMATCH Light Up LED Football - Perfect Glow In The Dark American Football - Official Size 6 - Extra Pump And Batteries - Cool Stuff - Birthday Gifts For Boys - Waterproof Glow Football With Two LEDs
50 Review
Maxler VitaWomen tabs, 90 pcs, neutral
32 Review
Patiassy Portable Professional Outdoor Volleyball Net Set With Adjustable Height Poles, Winch System, Volleyball With Pump And Carrying Bag For Backyard Beach
38 Review
Stay Active With BERTER Knee Brace - Compression Sleeve For Men And Women, Perfect For Running, Hiking, And Sports Activities
35 Review
MetalTac Airsoft Speed Loader With Capacity Of 100 Bbs
27 Review
6" Foldable Half Face Airsoft Mesh Mask With Ear Protection And Military Tactical Lower Face Protection By OneTigris
41 Review
Hornady Black Diamond By Umarex - Improved Product Name For Enhanced Search Engine Optimization
28 Review
Maddog® Sports Padded Chest Protector, Tactical Half Glove, & Neck Protector Combo Package
23 Review