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Autistic individuals display remarkable focus in their passions, and frequently less focus on things that don't interest them. If an activity falls outside of their interests, it may be hard to get them involved. It's important to understand their hesitation before you try to motivate them.  Don't push too hard, or you can seem overbearing and turn off the person. This is why it helps to incorporate their interest. If they're disinterested, try unofficially designating exercise time as time for them to tell you about their interests. This gives you the opportunity to connect with them, and makes them more interested. It is not uncommon for autistic people to struggle with certain motor skills. For instance, problems with motor development can prevent an individual from throwing a ball or balancing on a bike.  Your loved one may be self-conscious about their ability to participate in certain exercise activities. Not being able to successfully participate in activities can be very discouraging, so make sure you give your autistic loved one plenty of different options for exercise. Autistic individuals can be highly sensitive to certain stimuli. These sensory sensitivities may hinder their ability to take part in certain activities, even making them unbearable.  The bright light of a gym or sports field may be distracting or painful. Consider sensory sensitivities that may not be readily apparent when motivating your loved one to exercise. If you notice them getting uncomfortable, stop and ask what's wrong. Autistic individuals may struggle in terms of forming an exercise program. Unless assisted, it may be difficult for them to plan and monitor their exercise regime. Help them out by sitting down together and working it out, or by incorporating it into their daily routine. Recording different milestones and accomplishments within the workout program can be a great way to increase motivation and continue building confidence regarding exercise. Many exercise activities involve teams, meaning that some level of social interaction is generally included. Because many autistic individuals struggle with social interaction, this may result in fear of team sports.  Try pursuing more individual forms of exercise, such as running, cycling, yoga, or swimming. If they're close with a few particular people, e.g. their parents and siblings, then they may want to stick to backyard sports.
Know that autistic people may be disinterested in things beyond their special interests. Understand the presence of impaired motor skills. Take note of sensory sensitivities. Understand that having difficulty planning may be discouraging. Be aware of social impairments.