You can use the side of a piece of chalk or charcoal to create a gesture drawing with a strong feeling of weight and form, pressing more heavily on one side of the chalk to create tonal gradation within the single mark.
Try finding a range of subjects to use in gestural drawing. Try using gesture to describe a hand expressing different emotions. Draw a hunched figure, or someone dancing. Do a gesture still life of a favorite teapot, or an unfriendly cactus.