Elbow—Flexion
Stand straight in a relaxed position. Raise your arms above your till they naturally flex. Form a 90-degree angle using your elbows. Squeeze your biceps muscles as much as possible. Repeat.
Elbow—Extension
Stand straight in a relaxed position. Raise your arms above your till they naturally flex. Form a 90-degree angle using your elbows. Squeeze your biceps muscles as much as possible. Repeat.