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Fred - http://www.lift-all.com
I have always included light dumbells in my daily cardio workout sessions at home. I think exercise alone will not give you the full benefits like combining it with light weights would. Weight lifting helps in increasing the strength and force of the exercise regime which therefore provides faster and better impact and results. However, you need to always bear in mind to use only weights that suit your size and weight, else you might risk suffering from sprains and other muscular injuries.