When we experience painful sensation, we generally resist it, want it to change, or otherwise have some form of craving and aversion. This is wanting things to be different from how they are, either by trying to get something better, or by trying to get rid of what is present. The way of non-clinging releases this resistance. You can notice the sense of clinging through detecting contraction, stuckness, or resistance in the body, then you can release this by opening, softening, and allowing. Be present with this experience exactly as it is. This will open up a different way of being, with more lightness, openness, and freedom. Note that this is equanimity in regards to the primary experience in the moment, which still allows for taking action as appropriate to the situation.
Releasing Clinging
