What approach do you take to your practice? It is in the nature of the body to find creative new ways to feel alive.
Can you be hard and soft at the same time? what does that even mean? We all know our attention, when focused, can be powerful beyond measure. It can be compared to a rushing river than damned creates a pool. If we open the flood gates the water rushes out, it rushes in every direction it can and pours itself freely over the landscape. But if we were to pierce just the one hole in the damn wall, the pressure of the water would be immense, it would cut through space a long distance. There are plenty of metaphors for this.
And yet from the above example we can see there is nothing forced about this intensity. Neither do we need to force our focus in practice. Gentle, but persistent, keep bringing the awareness back. There is no other 'hole' we need to look for but we need to keep finding new ways out, that the 'silt' of our mental constructs doesn't plug it up.
In your yoga practice, focus; laser awareness on exactly what it is you are doing. This, like so many things, is easier said than done. But keep checking; are you thinking about what posture you are going to do next? how much longer you have to go? keep bringing your awareness back to that timelessness that arises at this moment; the experience you are currently having... and then again!
Of course it is possible to practice without focus, but your approach will determine your rewards. With distraction how can we truly notice the changes in ourselves? and until we notice this, how can we be of help to others? Your true value is in serving yourself and others. Sadhana to be gentle and strong, soft and hard, continuously aware of what is arising; then share it.