This exercise aims at minimizing stress in the joints thus reducing pain for arthritis sufferers, so it is good for the common types of arthritis.

Toe Dip
Step 1
Lie on your back with knees bent to 90-degree angles.
Step 2
Flatten your lower back against a mat and straighten your arms by your sides, lengthening your fingertips.
Step 3
Press the backs of your shoulders against the mat, and slide them down away from your ears.
Step 4
Inhale as you lower your toes toward the ground, then exhale as you return to starting position. Do 3–5 reps.

Source: Health