As we get more mature in age, we all look for new or better ways to regain some of the things from our youth. I am by no means old, but like most who could not use more energy during certain times of the day. Before you do any drastic changes to your diet or workout routine make sure you speak to your family doctor especially if you have not been active for a while. Once you get the green light, speak to someone you trust a friend, neighbour, or family member who is doing what you want to do move into a better way of life then mimic them. Chances are you will have to take the information that the trusted person gives you and make some adjustments to it, because we are all unique. However that being said the basics are always the same
Eating healthy, this should be 5-6 small meals a day. Your parents were right the most important meal of the day is breakfast it sets you up for success all day. Plan what you are going eat and approximately when (life does come up so be flexible). Drink water all of the time. 8-10 glasses of water a day. I know people will say specialized water is the best, however tap water is better than no water.
Working out regularly, pick the best time of the day for you. I like first thing in the morning, it sets my mind right on what my goals are for the day with regards to health. Pick workouts that you like, if you don't like it chances are you won't do it. Work out with friends, someone who will challenge you but not make you feel bad if you need an extra minute to rest. You have to listen to your body; you are the only one who knows how you feel. You maybe able to push an extra minute however what is it worth if you have to take a month off because it causes an injury.
Rest when you need to, this goes back to listening to your body. Sleep and rest is as important to anything else you will do during workouts. If you deprive your body of sleep your muscles will not be able to repair themselves, and you will have less energy to complete your workouts. That being said most people only need 6-8 hours a night. There are times when you get less and you still feel great, however the body will only be able to continue at that pace for so long, then it makes the correction usually in the way of sickness.
Have a great week.