I recently started to exercise and i realized that i have tingling from my ankle down. why could this be? is it bad? i use the biggest loser game

Nerve compression: Maybe compressed at the level of the ankle or more proximally, even as high as your back. See a doctor to help find the etiology.

Tingling: Tingling is usually a sign of nerve involvement and and suggest you get nerve conduction study to find the cause.

Nerve irritation: Usually "electric shock" or tingling type pains have a component of nerve irritation involved.