You could try sprinting. High impact interval training is supposed to rev things up a bit. It doesn't take as long as other forms of exercise. When I do my track sprints it takes about 15 or 20 minutes. When I do other stuff I only spend 5-7 minutes on it. It just kinda gets the body going a little. Also, I really think getting outside in the real sunshine, even if it is weak, and getting the sunshine in your eyes (without sunglasses) and on your face and skin is important. My boyfriend thinks I am nuts, but I swear that if I do it I feel overall more healthy and happy, better sleep and just more in tune with life. I know that's not specifically about body temperature, but I think being on a circadian rhythm is what Kruse is all about and exposure to real sunshine is huge for that.
Female, 5'3", 50, Max squat: 202.5lbs. Max deadlift: 225 x 3.