Chemical Warmers
Besides dressing in layers another trick to keep warm on the chilliest of days is to use a heated chalk bag or chemical warmers. Strap a body warmer (basically, a bigger version of a hand warmer; like Grabber’s “Peel N Stick” body warmer) to your chest near your heart to keep core toasty. By keeping your heart warm, you’re warming all the blood being pumped to your extremities. Just don’t put the body warmer directly on your skin because it can burn you. Try perhaps by putting it on the outside of your sports bra.