Don't forget that the outside walls for most garages are not insulated either.
Depending on your whole house AC sizing it may be possible to simply cut a tap off the supply duct. But I doubt it would be possible to really cool a garage. There is a lot of Square footage to deal with and all the insulation or lack of insulation issues.
Why not just join a gym? Or better yet get a job and work off those pounds and make some money. Then save the money on gym equipment and AC operational costs. A win/win situation.
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