Sinking to the low-level `some` of you guys used to operate..truckies could never find the shoes, so the sink would do...
Anyway, back on thread,.. always must do a full stall session b4 spinning, for all those good reasons, and certainly most JP`s, L-29/39S are very similar that you can get full aft stick and just sit there gently `nodding` away... it`s only the fact you are approaching the ground at about 5-6000 ft.min that startles some studes...
If you are spinning a piston a/c , to teach the effects of prop, etc used to go to altitude 8-10000, do the stalling bit, then do a stall, having turned the fuel off(mixture), and then pull up and hope the prop stops. Now demo spinning one way(4 turns), holding full aft stick, full opposite rudder until it spins the other way(4 turns). ;recover at leisure .., open mixture/press starter, etc,etc.