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A new lease of life.
If someone has a new lease of life, they have a new enthusiasm for living.
A pain in the neck.
You can say someone is a pain in the neck if they annoy you, or something is a pain in the neck if you don't like doing it.
A shot in the arm.
You can say something is a shot in the arm if it gives a person or an organisation renewed energy or enthusiasm.
Do you the world of good.
If something does you the world of good, it makes you feel a lot better.
Fresh as a daisy.
If you feel as fresh as a daisy, you feel energetic and lively.
Ill at ease.
If you're ill at ease, you feel tense or you can't relax in a situation.
Junk food
Food that is bad for us because it contains large amounts of harmful substances like artificial colouring, preservatives, salt, refined sugar, and so on.
Just what the doctor ordered.
You can say something was just what the doctor ordered when it was exactly what was needed.
Kick the habit
If you kick the habit, you manage to stop doing something that has become a bad habit.
On your last legs/on its last legs.
If you say you're on your last legs, it can mean you're close to exhaustion, or it can mean you're close to death. If a thing is on its last legs, it's close to breaking or wearing out.
Recharge your batteries.
You recharge your batteries if you do something to regain your energy after a period of hard work.
Stick out like a sore thumb.
If someone sticks out like a sore thumb, or stands out like a sore thumb, everyone notices them because they're not the same as the people around them.
Teething problem/teething trouble
If someone or something is having teething problems, or teething troubles, they're having problems during the early stages of something.
Under the weather.
If you are under the weather, you're not feeling well.
Verbal diarrhea.
If someone has verbal diarrhoea, they can't stop talking.
Vim and Vigour
If you have vim and vigour, you have lots of energy and enthusiasm for life.
Warts and all.
If you show something warts and all, you show it exactly as it is without trying to hide any of its faults or weaknesses.
Weak at the knees.
If you go weak at the knees, you feel an emotion so strongly that it makes you feel unstable on your feet.
You are what you eat.
You can say "you are what you eat" when you want to point out the connection between food and health.
Sick as a dog.
If you're as sick as a dog, you're very sick