For four years I worked as a personal trainer. Every January, the gym was packed. New shoes, big goals, two-hour workouts. By March, most of those people were gone.

They weren't lazy. They just started with a plan they couldn't keep.

I see the exact same pattern with money.

The money version of January

Something wakes us up. A friend gets sick. A new baby arrives. A birthday with a zero at the end. We decide to "finally sort out our finances." We read everything, open three new accounts, set an aggressive budget, and promise to review it every Sunday.

A few weeks later, life happens. The plan gets too heavy to carry. So we put it down, and feel a little worse about money than before.

Crash diets fail. So do crash financial plans.

What actually works, in the gym and with money

1. Measure first. A good trainer never writes a program before an assessment. You need to know where you're strong and where you're not. With money, that means looking at protection, savings, retirement and being organised, not just your bank balance.

2. Pick one thing. Nobody needs ten new habits. You need the one that matters most right now. Maybe it's making sure your family would be fine if your income stopped. Maybe it's finally knowing what your retirement savings will actually pay you. One gap at a time.

3. Make it small enough to keep. A plan you can afford and understand beats a perfect plan you abandon. Steady beats extreme.

4. Check in regularly. Trainers re-test every few months. Your plan deserves a yearly check-up too, because your life changes: new job, new home, growing kids.

Your first assessment

That's why I built the Financial Fitness Scorecard. It's the same idea as a fitness assessment: four minutes, seven areas, and a personal report that shows you the one place to start. No crash diet required.

This post is general education, not financial, tax, legal or investment advice, and not a recommendation of any product. Insurance products are offered only in states where the agent is licensed and are subject to underwriting. Talk to your own tax adviser about your situation. Related: Financial fitness