Final answer:
For a comfortable and safe riding position, maintain good posture by sitting forward enough to move the hand from the palm backward to palm forward position without strain. Proper posture prevents back issues and enhances control.
Step-by-step explanation:
When positioning yourself comfortably before riding, it's important to sit far enough forward so that your arms maintain good posture. This alignment helps to avoid back strain and possible damage to your spinal disks. Whether you are sitting or kneeling, as when taking a photograph, bracing your arm or elbow on your knee can provide additional support and stability. Therefore, for a comfortable and ergonomically sound position, sit so that you can move your hand from the palm backward position to the palm forward position rather effortlessly, which suggests a sufficient and secure reach to the controls or handles.