yes, a cushion, but every one I’ve found is too big and doesn’t fir my backpack where I have more stuff (clothes, an umbrella…).
I like doing yoga and stretching outdoors, so the ground may also have loose dirt, broken pebbles and grass…
If I bend on my fours, raise-stretch a leg with the other leg’s knee touching the ground to hold most of my weight with this leg’s foot stretched to the back and still touching the ground, raise-stretching one arm and only using the other arm not to fall to the ground, the knee touching the ground hurts.
I’ve tried folding a small towel three times, but I’m so skinny that my knee still hurts.
Folding a yoga mat doesn’t help either.
What works for you?
Look for a knee pad for gardening. Go to the gardening section of your local home improvement store. They’re just big enough to kneel on. If that’s still too big, maybe look for an inflatable camp pillow or camping cushion of some sort.