Human Flag Plank

The human flag plank, also known as a flag plank or foot-assisted human flag, is a beginner-to-intermediate progression for learning the mechanics of the Human Flag. You grip a secure vertical structure with both hands, lean your body sideways and lift one leg while keeping the other foot in contact with the ground.

The goal is to imitate the wide leg position and body alignment of the Straddle Human Flag. The grounded foot supports part of your bodyweight, allowing you to practise pulling with the top arm, pushing with the bottom arm and bracing your lateral core without supporting your entire body in the air.

This is not the same as a conventional side plank. In a side plank, one hand or forearm supports the body from the floor. In the human flag plank, both hands remain on a pole, stall bars or similar structure in the same basic arrangement used for an unsupported human flag.

The exercise is particularly useful because the amount of assistance can be adjusted easily. You can keep your body more upright and press firmly through the grounded foot at first, then gradually lean farther away and reduce how much weight the foot supports. The human flag progression guide provides additional exercises for developing the complete skill.

A foot-supported flag plank is also recommended as an early human flag progression in this human flag technique and progression guide.

The human flag plank is a full-body isometric exercise that combines a top-arm pull, a bottom-arm push and lateral trunk stabilization. The grounded foot reduces the total upper-body load, but the shoulders, back and core must still work together to reproduce the human flag position.

Primary Muscles

• Latissimus dorsi: The lat on the top-arm side contributes to the downward pulling force that supports the upper end of the body.
• Deltoids: The shoulders stabilize both straight-arm positions, with substantial involvement from the bottom shoulder during the pushing action.
• Obliques: The internal and external obliques resist lateral flexion and help lift the hips into the assisted flag position.
• Abdominals: The rectus abdominis and deeper abdominal muscles brace the torso and help control the pelvis.

Secondary Muscles

• Serratus anterior: Supports scapular control and the active pushing position of the bottom shoulder.
• Trapezius and scapular stabilizers: Control the shoulder blades while the arms apply opposing forces.
• Teres major: Assists the latissimus dorsi during the top-arm pulling action.
• Triceps: Contract isometrically to maintain elbow extension, particularly in the bottom arm.
• Forearms and grip muscles: Maintain secure contact with the structure.
• Quadratus lumborum: Assists the obliques in resisting side bending.
• Gluteus medius and minimus: Lift and stabilize the upper leg in the straddle position.
• Hip adductors: Help control the lower leg and stabilize the pelvis.
• Quadriceps: Keep both knees extended during the hold.
• Gluteus maximus: Helps maintain hip extension and prevents the pelvis from folding.

The exercise reproduces many of the muscular actions used in the Straddle Human Flag, but the supporting foot shares the load with the upper body. As foot assistance decreases, the demand gradually approaches that of an unsupported Human Flag.