NEW YORK (CBS) Lydie Langevrn trains to become a personal trainer, so she's especially careful about the food she puts in her body before her feet touch the treadmill.
"It's important to get more energy, give you strength to work out," said Langevrn.
Your trainer and celebrity trainer Harry Hanson says eating the wrong food before you can work up a sweat can pull you down.
Of course, fried or greasy foods are a big no-no, but high-fiber foods like vegetables can also cause problems.
"You do not want to eat anything that sits in your stomach and tries to break down during exercise, especially if it's an intense workout," said Harry Hanson, a personal trainer.
Spicy food can cause heartburn or cramps, and carbonated drinks can make you feel bloated or full. Experts say nuts are another food that you should avoid right before training. That's because nuts are high in fat and take longer to digest fatty foods.
Hanson recommends that customers eat a banana 20 minutes before training.
"Because it's a light carbohydrate, a complex carbohydrate will hold insulin in your or sugar in your system for a long time," Hanson explained.
Dimitri Ouattara says he avoids everything that makes his body hard before he trains.
"I like it when I feel light I train because I can do more I feel freer I'm more agile," said Ouattara.
And what you eat after exercise is just as important.
Hanson says he has a protein bar or a lean protein Meat and vegetables help your body to recover and repair itself.