I like the idea a lot. Strength is not just about basic concentric move. Isometric exercise is also part of the challenge which can result to gains. I would love an isometric workout mixed with mobility and core.
ETA: Cathe has made us do wall squat in XTRAIN series, Total body triset lower body. The wall squat starts with a dumbbell pick up set followed by an isometric hold to complete a set of reps. I love it.