When it comes to human habitable planets, among other things, mass does matter when it comes to Gravity.
As can be seen above mars Mars has significantly less gravity than earth.
Now this is great for jumping etc. but it's not so great for the body.
The human body has been evolved to the state its currently in on this planet and its fit for purpose here.
When you leave an astronaut up in the space station for a couple of months the body reacts adversely to the weightless conditions.
For one... the bones lose mass and density.
In simple terms the astronaut gets a bad case of osteoporosis. That's why they need to be carried around until they have undergone sufficient rehabilitation to re-strengthen the bones.
On mars you'll experience 62% less gravity, be significantly lighter and extra special precautions and activities are going to be required to keep you in shape and fit... and that's just the things we know about from short stays on the international space station.