Try focusing on one thing at a time.
Write one email at a time.
Eat your lunch mindfully.
Drink your cup of coffee attentively.
Read your book with full attention.
Drive your car with full attention.
While conversing, keep your mind on the conversation and prevent it from drifting to the TV screen in front of you, to the noises around you, or to people coming and going.
If you meditate, focus on the subject of meditation, and when your mind wanders, bring it back.
Align your mind with what you are doing. Don’t do one thing, while thinking about something else.
When you catch your mind wandering, bring it back to what you are doing. This might not be easy, but if you keep trying you will gradually succeed.
Become aware of your thoughts, and always bring your mind back to what you are doing.