For your gestures (and subsquent drawings) you are outlining. Try scribbling the whole mass in. Circles and scribbles for main parts (chest, quads, head, biceps, etc) and longer line scribbles for the thinner parts of the arms and legs ending in smaller circles again for hands and feet.
Think blocking over outline. ;)
Other than that keep up the good work and practice, practice, practice.
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