Despite his back injury that remained for rest of his life, Lee's striking speed from three feet with his hands down by his side reached five hundredths of a second. Lee could take in one arm a 75 lb barbell from a standing position with the barbell held flush against his chest and slowly stick his arms out locking them, holding the barbell there for 20 seconds. Lee's combat movements were at times too fast to be captured on film for clear slow motion replay using the traditional 24 frames per second of that era, so many scenes were shot in 32 frames per second for better clarity. In a speed demonstration, Lee could snatch a dime off a person's open palm before they could close it, and leave a penny behind. Lee would hold an elevated v-sit position for 30 minutes or longer. Lee could throw grains of rice up into the air and then catch them in mid-flight using chopsticks. - Witnessed by many such as Joe Hyams Lee could thrust his fingers through unopened cans of Coca-Cola. (This was when soft drinks cans were made of steel much thicker than today's aluminum cans). Lee performed one-hand push-ups using only the thumb and index finger. Lee performed 50 reps of one-arm chin-ups. Lee could break wooden boards 6 inches (15 cm) thick. Lee could cause a 300-lb (136 kg) bag to fly towards and thump the ceiling with a sidekick. ( According to Bob Wall, he has the video tape of him kicking 300lb bag towards the ceiling.) Lee performed a sidekick while training with James Coburn and broke a 150 lb (68 kg) punching bag. In a move that has been dubbed "Dragon Flag", Lee could perform leg lifts with only his shoulder blades resting on the edge of a bench and suspend his legs and torso horizontal midair. Bruce lee was able to jump 8 feet from a stand still (this was shown in pictures and his films such as the one where he kicked the lightbulb out).