India, Dec. 2 -- Berlin (dpa) - One and two and three and four: when you swing a skipping rope, it might transport you back to when you were a kid - even if you feel a bit less light on your feet. No problem. What used to be a good way to fill your break time can now be a good workout and you might not even struggle with your your inner couch potato. That's because skipping is low-threshold and requires very little equipment, space or time. What exactly can I train by skipping? "Just a few minutes of skipping gets your circulation and metabolism going," says Elisabeth Graser, lecturer at the German University for Prevention and Health Management (DHfPG). Specifically, skipping has the following effects: It strengthens the cardiovascular sys...