Higher Gravity

You can get a rough idea of some of the changes to your body by looking at other creatures that have a much higher mass than humans do.
Elephants for example.
They have short, stumpy legs that are extremely strong.
If you were born in a high gravity environment you'd have short, stumpy legs that were very strong too.

You'd be built much lower to the ground.
Your heart would have to be much stronger to pump blood up to your brain and you'd need a serious pressure regulation system to stop yourself blacking out or your head exploding due to variations in blood pressure as you moved around. Similar to giraffes.
Your bones would be much stronger and your main supporting joints, knees etc..., would be much less flexible.

It is possible that on a high g planet humans would eventually evolve rigid necks and then eventually no necks at all and possibly no head either. All the things inside your head would become incorporated into your main trunk so they'd be closer to the ground.