michelle, i have a question for you. i am 61, 5' 10'' and 145, i want to lose some more weight, i have started jumproping. Is that as effective as running if you do it a certain amount of time? if so, for how long a day should i do it. Ive been doing about 400-500 a day but it doesnt seem like enough. any advice, e-mail me. SHISTAHYMYA @ aol.com wierd name, i know.