How do I help my horse loose weight?

My horse is a middle weight 16hh gelding. He is on limited grazing at the moment and all he has is some basic chaff in the morning (literally a handful). He is not being exercised at the moment due to injury but it should only be a couple of weeks off. He just seems to put weight on soo easily. What are the best techniques to making him loose wieght?
Also, what are some good techniques to help him loose weight when i can ride again?

need help with weight loss exercises?

hi i need help with weight loss exercises. Actually When i was in school i was around 85 kgs. And i Remained 85 kg Even After i Passed Out From School. Then i Went to paris for further studies and there i lost Dz kgs. So now my current weight is 67. All the extra weight from my body is gone Except My stomach. So please advice me how should i reduce my stomach weight and make it completely flat.