It is the intention that matters. If you intend to fully, completely exercise your body, your whole self will need to be involved with full attention. It is intense but lacking commotion which scatters attention. Scattered attention causes scattered and incomplete motion causing damage. The outside is distraction.
Attention comes from the inside.
The soft method considers the inside of the body before it even thinks about the outside - unlike Hollywood America. It concentrates on deep breathing which is not strained but natural. This primarily relaxes the body and allows clean oxygen to flow through everywhere inside. It aims to strengthen the body and heart as well as make it flexible. Movement for aerobic activity is done to the point of efficiency, not stress.