What muscles does the V-Up work?

Mainly the abs. It also works the quads.

What equipment do you need for the V-Up?

None. It is a bodyweight exercise.

GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Bird Dog.

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Supine core rep that lifts the torso and straight legs at once until the body folds into a V shape.

Lie flat on your back with your arms extended overhead and your legs straight.
Point your toes, brace your abdominals and lift your feet a few inches off the floor.
Exhale and raise your torso and legs at the same time, keeping both straight.
Reach your hands toward your shins at the top so the body forms a V.
Inhale and lower your torso and legs together under control.
Stop with the feet just above the floor to keep tension, then start the next rep.

Rounding the back and shoulders at the top, which loads the lumbar spine instead of the abdominals.
Swinging the arms to generate lift, which replaces core work with momentum.
Resting the feet on the floor between reps, which drops tension and makes each rep a fresh start.
Bending the knees to reach the top position, which shortens the lever and reduces the demand.

What muscles does the V-Up work?: Mainly the abs. It also works the quads.
What equipment do you need for the V-Up?: None. It is a bodyweight exercise.
Is the V-Up good for beginners?: GymVim rates it intermediate. For a beginner-rated exercise on the same muscle and movement, see the Bird Dog.