Step 1: Approach:
We classify the exercise by what the muscle does. Either its length stays fixed, or it changes.
Step 2: Apply it to the question:
The question says muscle length is increased and the muscles are toned. So the muscle length is changing during the action.
A change in length with movement of the limbs is the mark of isotonic work.
Step 3: Rule out the rest:
Isometric work has no length change. Isokinetic work needs a machine that fixes the speed. Anaerobic is an energy system term, so it does not describe running, jumping and calisthenics as a contraction type.
Final Answer:
\[\boxed{\text{Option 2: Isotonic Exercises}}\]