Some people press on the accelerator using the heavy part of the foot, like the heel.
有些人用脚上比较有力的部位，比如脚跟，来踩油门。
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The British press dubbed the 5 foot 6 inch girl "Britain's Fattest Teen," but it wasn't just the cruel title that motivated her to take action and lose weight.
Gradually add more body weight over the foot, allowing the ball to press into your arch. Begin to slowly move your foot, allowing the ball to massage your heel, forefoot, and toes.