tthe slightest stretch of claf muscle causes charley horse. if i strecth soome other muscle will get contracted, like neck, stomach muscles, even bicep and inside my body. In one morning i got 6 charley horse ib my calf muscle, 3 times on each leg and all were absilutely horrible. i got on on my neck just siting on my chair wtf... is this unusual and what causes it? im 29yo male, in shape ans active.