Human: I'm trying to find out what the best exercise is for someone who has arthritis. Assistant: 
The best exercise for someone with arthritis depends on their individual needs and abilities. If you have mild arthritis, it may be beneficial to focus on exercises that strengthen your core muscles such as yoga or Pilates. For more severe cases of arthritis, low-impact aerobic activities like walking, swimming, or biking can help reduce joint pain and fatigue. It's important to consult a doctor before starting any new exercise program.