Getting fit with AMC

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Hello all! I'm a 25 year old with AMC looking to get healthy. I have no use of my arms, and very minimum use of my legs, so this is going to be a challenge! I'm wheelchair bound, but can push my chair around the house with my legs.

My goal is to lose about 30 pounds, taking me from 155 to 125.

I could really use advice and motivation! :)

So far, I've done chair sit ups while clenching my tummy muscles for 25 minutes.