Gesture should HAVE Anatomy, it's just the speed at which you draw it.
Gesture is a method of practicing drawing.
Anatomy is the system of body proportions.
I think it best to learn anatomy in stages, starting from macro shapes of the torso and pelvis outward. Supported by learning skeletal and superficial muscle structure to understand how things look just under the skin. The ability to recognize the shapes of the body along with the proportions give you an understanding of anatomy.
Now gestures is a method of training yourself to draw fast and accurate. 10-30 seconds is only enough time to capture a pose and basic proportions. You're going so fast that your eyes have to translate what they see to your hands on instinct. It's a good way to loosen up the drawing arm and mind to have you focus on macro shapes cause the thin lines for drawing too easily lend themselves to detail.
I would pair gesture with Contour Drawings where you draw what you see in a single line without lifting the utensil. That trains the brain well too 
But if you haven't studied anatomy than your gestures will be out of proportion. They go hand in hand so the best way to practice I think is the drawing class method.
Many 10-30 sec gestures, Some 1-5minute drawings, a couple 10 min and one 30 min drawing. Or some other arrangement like that.
https://line-of-action.com/practice-tools/figure-drawing
This is my favorite site for practice. I also study from The Atlas of Anatomy for Artists (a book) for more detailed understanding of bone and muscle structure. I find it important to know it all in realism so abstracting it later for my art style gets easier.