脚内侧 meaning in English

inside of foot
instep

In side kick
脚内侧踢球
You should feel distinct pressure on the inside of your right foot , as though you are actually pushing off that foot
当然你会自然地感觉到加载于右脚内侧的压力，感觉上就像你的右脚要向右侧蹬出去一样。
1 . pull back your right foot but keep your thigh parallel to the floor . move your left hand up and forward , then down to the side of your right hand in front of your chest , turning both palms up
挪:重心后移，左脚尖翘起，身体右转，左脚尖内扣，右脚收于左脚内侧，脚尖点地成丁步，同时右手向下划弧与左手成抱球状，右脚向前上步，脚跟先地，弓步挪。
Draw your right hand past your right ear and push it forward , palm out , at eye level . lower your left hand until it comes in front of your left hip , palm up . bring your left foot forward , forming an empty stance , look at your right hand
挪:身体微向右转，左脚收回右脚内侧，脚尖点地成丁步，同时两手成抱球状，左脚向前上步，脚跟先地，重心前移，右脚以脚掌为轴脚跟向后蹬转，左手向前挪出，掌心向内与胸同高，右手落至右髋关节外侧。