There are several safe and comfortable exercises for individuals who suffer from arthritis. Water-based exercises help alleviate pressure on the knees and offer a good amount of resistance and cardiorespiratory conditioning. If water is not an ideal solution for you, try lower impact exercises using low to moderate weight and continuous support for your knees like ball squats and ball bridges. To strengthen your hips and alleviate pressure on your knees side-to-side tube walking is a good alternative. These exercises, if done correctly, place minimal stress on the knees and will help strengthen your hips and legs. When performing any of these exercises, make sure your knee stays in line with your toes during the movement.