FlightCamp TRX plank can be especially challenging with the combination of suspension, points of contact, and angle of movement. Check out some examples of correct plank allignment in 2 common TRX positions.
Sagging/Disengaged:
Tucked:

Alligned plank:
Arching :
Tucked/Hanging:
Alligned Plank:
Take Flight......
sweat, strength and fun.
The FlightCamp TRX crew