What kind of stmina are you trying to build, cardiovascular, strength? You should do more than one exercise for whatever it is you are trying to accomplish. We need more information on what your goals are.
Something about your heart rate...... (you know the funny thing who says bum bum bum.....) Please tell us a little bit more about yourself and your goals (and fill in your profile!!) so we'll be able to give you a better answer as well.
-------------- - Nina :o) Vous êtes tous magnifiques!