One tip - is to not add construction to the gestures. Gestures are abstractions. They do not represent anything physical - but motion itself. Scribbles are closer to that because you are not doing any construction - now imagine taking those 30 seconds and spending 2 minutes on one pose. Now do another two minutes 2 or 3 more times on the SAME pose. What have you learned about representing the motion of a figure in the drawing in that exorcise. What did you stop doing? What captured the essence more?
Rhythms help with this - I just posted a critique in the critique section with all those links to helpful rhythm videos.
2 Minute figure drawings in a figure drawing session are warm ups to get proportions right - you will quite quickly move onto 5 minute and 10 minute poses in an afternoon session.
You also have to try to do a long drawing- 30 minutes to an hour. You will soon see that what your brain pays attention too in those initial stages are different than what it pays attention to in the last stages.
Your two minute gestures do not need to be the skull, rib cage and pelvis connected by the spine first. What is the action line from skull to pelvis, or skull to foot, or fist to fist?
Draw that, then focus on height and width of the figure - and that is IT. That is all you need for a gesture. Any longer and you get into construction in a five minute drawing.
I have a few other talks on gestures in the critique section I believe you can search for them.
Steve Huston - "Making Every Mark Count"
"1: Gesture is the fundamental design line.
2: The gesture line must act as the connecting line, something to which the structure can attach."
(structure is your construction method of making a mannequin)
If you are stuck on this, just think - long side, short side, top, bottom, center line. You can do that. You can count to five.
Side, Side, Top, Bottom, Center. Over and Over and Over.
Each section of the body has to have those completed.
Torso - Head - Limbs - Extremities
Things like the head can be a circle or a triangle or whatever, but - to each their own.