Back exercises:
From a normal sitting position in the car, slowly roll your bottom (forward) away from the seat so as to form an arch in the small of your back. Hold for five seconds and slowly roll your back flat against the seat. Repeat this process two to five times as required. This helps to strengthen your back, especially if you are unable to sit for long periods due to backache or stiffness.
Adductors (Inner Thighs) Workout:
Position a tennis ball between your knees and give it a powerful squeeze with your inner thighs, holding a few seconds with each contraction. Complete two sets of 15 repetitions to start, working up to four sets over time.