These three core exercises will strengthen and tone your abs fast.

Learn how to do planks and the benefits of planks for everyone.

How to do mountain climbers for a great core workout.

As a trainer and runner, I was instantly interested in the Will Smith workout from his latest YouTube series, “The Best Shape of My Life,” where Will works out to lose 20 pounds in 20 days through a running and strength training fitness program.

How to do lunges for runners.

Here’s how to do burpees, which build strength and endurance and boost metabolism.