A common cause of low energy is a deficiency in Vitamin B12.  This can be found in fish, red meat, poultry, and milk.  If you have low energy, ask your doctor to check your levels at your next bloodwork.  You can also add a multivitamin - it will include this energetic vitamin.

Set training goals.  Maybe you want to be able to run a mile without being out of breath or lift a certain amount of weight.  The journey to reaching these goals will make working out more exciting and engaging if you set and keep track of them regularly.

Cooking is a great hobby and it can be fun and get your creative juices flowing.  It also allows you to control what goes into your food. Instead of going out for an expensive or unhealthy dinner, take a cooking class for the basics and/or having fun experimenting on your own.  Don't forget the veggies!

Exercise has many physical benefits and psychological ones, too.  Releasing endorphins while exercising is great for preventing or even improving anxiety and depression and can give you a sense of accomplishment.  It can be hard to start exercising, but more often than not, you will be in a good mood after a workout.  Having one of those dragging days?  Give exercise a chance to turn it around and you will be glad you did.

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Multivitamins - are they necessary?  Yes, I recommend taking one daily, assuming no medical contraindications - always check with your doctor if you are not sure or have medical conditions.  It is a difficult task to know if you are getting enough of every type of nutrient to optimize your body function.  Some days, you may get all of your vitamins but other days, your diet may lag in diversity of food groups.  Take 3 seconds out of your day to take a multivitamin you will have all your vitamin and mineral requirements covered.  And yes, it is better to get your nutrients from food, but  since it may be difficult to eat perfectly every day, a vitamin will do just fine to supplement your diet - hence its name!

The best way to exercise is without realizing that you are exercising.  Make exercise social.  Go to the gym with a friend or schedule a weekly tennis match.  Go hiking and explore the outdoors.  You can then focus on the enjoyable activity and maybe for a second think about how great of a workout it is, also.

Want to get more fruits and veggies into your diet?  Try juicing.  And don't make it a super complicated project.  Just throw some vitamin-rich spinach or kale into a blender with ice and a couple fruits of your choice (plus some low calorie liquid drink to hold it together).  The sweet fruit will overpower the  moredull bitter tasting vegetable and you get the nutrients of both.  You may even have more energy throughout the day from all the vitamins!