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.....is a starting concept to play an elastic body as a mass-spring pendulum.
If you take a look at a lot of theory : https://youtu.be/_qnRudiEfwI
.....then to a short "pragmatic" movie : https://youtu.be/dkPX8Ce0jIk
.....we really have some beginning images to think about.
     Now , let's replace the performer ( elastic body ) with a mass-spring system , if we intend to make a "copy" of this sport/game as a rotating elastic/spring pendulum (equivalent to a half-pipe skating/pumping...)...but with a repetitive starting point...?!
     Take a look at : https://youtu.be/GlhGh5bgXmg
      If we replace the rods with a single tube (supported in the middle/pivot ), then we introduce the small rod as a free sliding mass in , and add two springs inside...have we a "new game" related to gravity and inertia ?!
      A spring (any of them) "mimics" performer's  "crouch " and "hands up"  as an "elementary robot".
      The inside free sliding mass/rod can slip in a momentarily / short time on an inclined track/tube...so to attain again the  starting point and make a contact with the second spring ?!
      For me the "spring-sliding mass-spring" is a factual expression of the atomic (a-tomos) concept face to phenomena (gravity and inertia).
      By all means , a simple test can be more conclusive about a possible "loop the loop " and why not?..a hopeful "self" motion !?
       Al_ex

.....with 2*g , at the bottom of his swing , if we drop a simple pendulum from the horizontal position :
     https://physics.unm.edu/pandaweb/demos/questions/predictive1/index.html
.....with an acceleration >2*g , at the bottom of his swing , if we drop a simple pendulum from the vertical position/inverted pendulum , but in any test ...it never makes a full (360 *) turn.
     Regarding an elastic / spring pendulum , if we drop it from the horizontal position have we something alike the half-pipe performer's "higher and speeding up " feat ?
     Even more...if we drop an elastic/spring pendulum from the vertical position/inverted elastic pendulum in a simple test...it...a full(360*) turn ?!
     Al_ex

  Hi Kolbacict !
To discard part of mass of the pendulum at its lowest point , when velocity and kinetic energy are maximal...so to play a "rocket" pendulum ?
If you take a look at : https://youtu.be/yPfhISP82bk
                                https://en.m.wikipedia.org/wiki/Newton%27s_cannonball
...you can see the similarity rocket/cannon.
Anyway , you need a continuous supply ( mass or...fuel ) and...what for?!
  Al_ex

 Hi !
Take a look at :  https://youtu.be/wdrgnOqPOj4o
It's a Valerij Ivanov channel with "mirage physics"...with an usually. "trick " in an "enclosure" : this time a gravity liquid state waver.
I made him a "transparent" proposal for a "new game" (gravity solid state/pendular waver )  vs. his game:
-an transparent tube (two springs and a free sliding mass/rod , inside) , something alike as.: https://cdn.britannica.com/67/2467-004-D3ED73BC/springs-equilibrium-distance.jpg
-an horizontal axis/pivot supporting the rotation of the tube ,in the middle
-not other "hidden spare parts"...but to apply "half-pipe skateboarder's" physics
In my opinion it can be a possible fun game/test for anyone...
Al_ex