You can run, lift weights, do yoga, take classes-there are tons of options. Any exercise is better than none, and if you're feeling out of shape, try doing a little more than whatever you're currently doing.

A healthy week's worth of exercise should include: Some cardio, some strength training.

You might be a runner who gets in a few strength sessions, or a lifter who hops on the rower for a little cardio once or twice a week. Or maybe you play a sport that gives you a good mix of both in every practice.

If you're new to everything, explore until you find something you love. Then find a program, team, coach, or long-term goal to structure the rest of your training.

Sleep enough

There are entire industries that sell things to people who don't have enough "energy." You could buy their vitamins, gadgets, or motivational advice...or you could just get enough sleep in the first place.

If you routinely get six hours or less, fixing that will probably solve a huge number of what might otherwise seem like health or "energy" related problems. Most people need between six and nine hours. The way to get more sleep is usually just to rearrange your morning and evening schedules to allow yourself enough time in the sack.

There are many healthy ways to eat, so don't worry too much about whether you've found the optimal one. All of the healthy diets involve lots of fruits and vegetables, and not too much sugar.

If you're trying to lose weight, know that all of the diets and fasting schemes out there work the same way: they result in you reducing your calorie intake. Beyond that, they each have their own pros and cons: you might feel more full and satisfied on the high-fat content of the keto diet, or you might prefer the simplicity of intermittent fasting, or maybe you enjoy a lot of the foods you can eat on an old-school low-fat diet.