Paul would write this to Timothy (1 Timothy 4:7b-8) - train yourself to be godly. For physical training is of some value, but godliness has value for all things, holding promise for both the present life and the life to come.  

Look at that: Physical training is of some value. We all know that.  Lifting weights, cardio, yoga, martial arts training, running, swimming, etc…all of those have benefits for our body. Taking a walk is better than just sitting and watching TV Surprisingly, you don’t get in better shape watching ESPN all day. Although if you did, we would most likely have some pretty healthy people around here.  

Paul says the same thing is true of our faith. In other words, with our faith, there is Some Assembly Required. But it's important because it holds promise for both the present life and the life to come.