Hi Tyson,
Most thals I have met are slender in build, but I think that with resistance training thals can be toned. I don't think that thals should be on high protein diets etc. to build muscle because that could be tough on the liver and kidneys, however with a balanced diet and regular exercise hals can build strong bones and muscle. Be sure to have enough calcium, magnesium, zinc, phosphorus and vitamin D in your diet to achieve these benefits from exercise.
I hope this helps,
Sharmin