I find it very useful for many reasons.
– I can concentrate on my breathing while meditating which in turn makes the cool down effective.
– I can reflect on how my body has progressed over the weeks and my increased strength and stamina during my workouts.
– Conquering my fitness goals in the beginning of the day sets me up for success for the rest of the day. This has a very positive impact on my meditation.
– I save time as I club cool down and meditating together.
I have a Kangaroo mat that I use with my standing desk and I sit on it while I meditate since it's cushy enough that I don't get distracted by the discomfort of the floor, but it's also somewhere I only sit when I meditate, so I don't slip into a work headspace or get so comfortable that I forget what I'm doing.
For chakras I sit on my mat criss cross position. For awareness it depends. Sometimes on my mat or bed. Position either criss cross or kind of in a prayer position.