Advice for mounting exercise hooks to a section of drywall without studs

Question

I'd like to mount three hooks to the wall to enable TRX work and band work. One high (TRX, full weight), one middle (band work, light weight), one bottom (heavy stretching bands, medium weight). I weigh 200lbs so assume max pullout force is 300lbs.
The section of the wall that I need to mount the hooks is between a corner and a doorframe, and does not have any studs, metal or wood. There is a metal corner bracket shaping the drywall (standard). Photo is at the bottom of this post.
My thinking is to buy a sturdy sheet of 1/2 ply, cut it to width, and attach it with multiple snaptoggle anchors. Despite this distributing the weight, I've never relied on only drywall for this type of force.
Any thoughts on how realistic this is and suggestions on other approaches?

jay613 · Accepted Answer

Find and use studs for this.   Dynamic human weight ... moving, vibrating, 200 pounds in motion being pulled to a stop by the wall.  Drywall anchors are not designed for that, nor is drywall.   You want 3-inch lag bolts centered carefully on wood studs or toggle bolts through metal studs and ideally multiple ones for redundancy.
Also I agree with the comment above ... roughly a zero percent chance that you don't have a stud at the door frame and in the corner.  How do you know you don't?   And if it's true, and you do what you said with the plywood etc, you'll just snap off the whole sheet of drywall when you hang from it because there is nothing holding it up other than a corner bead and its own rigidity.

Advice for mounting exercise hooks to a section of drywall without studs

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