My “go to” meditation (at any time of the day) is the Five Senses one –
Breathe – become aware of my breathing and try to make my out breath longer than my in breath (so in for 4, out for 6). Do that 3 times. Relax my shoulders down with each out breath.
What can I see? Look around and notice the detail of 5 things – something above you, to the left, right, under your feet, directly in front of you.
Am I still breathing 4 in, 6 out
What can I hear? Close my eyes and listen for 4 things (eg, birdsong, the wind, traffic, conversation)
Am I still breathing 4 in, 6 out
What can I feel? Eyes still closed, 3 things – (eg. my feet on the floor, the chair supporting my body, the heat of the sun, the wind on my face, the tickle on my eyebrow)
Am I still breathing 4 in, 6 out
What can I smell? 2 things – (eg. flowers, exhaust fumes, cigarette smoke, the rain)
Am I still breathing 4 in, 6 out
What can I taste? – 1 thing (eg, coffee)
Am I still breathing 4 in, 6 out.
If your mind wanders, just go back to where you left off. Don’t attach any emotions to what you observe.
No reason why you can’t do this when you’re out walking (I do), sitting at your desk, staring out of the window waiting for the kettle to boil, laid in bed, in the world’s most boring meeting. Wherever you like really. It takes about 5 minutes.
A shortened version is what can I see, hear, feel. It just momentarily switches your brain off from the madness.