It is true of buying stuff.

It is true when it comes to success, achievement, and doing what needs to be done. 

It is true of taking care of your body.

You can do something now or pay a bigger price later.

When you make the payment now in the form of exercise, and doing work that matters, life becomes easier in the long run.

This is in a way experiencing pain now to make your life easier in the long run.

Hope you make the right choice.