When being mindful in Mahasi walking meditation, should the meditator walk very slowly in order to get time enough to fit the noting in? What should the meditator's attitude be if they skip a mantra note? Should one strain hard to get the prechosen mantra note right? How should one approach mistakes? What kind of concentration is needed? Is it enough to just be mindful with superficial concentration or must a high degree of concentration be developed? With momentary concentration, can the meditator get stuck to an object like with non-momentary concentration? What would right-concentration be with this kind of walking meditation practice?

Without any thought automatically start the walking and it's last for 15 minutes. How it's related to meditation.

I recently came across the concept of doing walking meditation, but I am not clearly aware of the technique or procedure to do walking meditation. Can someone help me understand this? Thank you.

Walking meditation : http://www.meditationoasis.com/how-to-meditate/simple-meditations/walking-meditation/ is considered as "just as profound as sitting meditation". If we were to extrapolate this idea into a situation where instead of walking you were on a bike, would an expert's opinion consider this meditating on the bike at the gym an effective practice of meditation?

I've read that things like aikido, yoga, swimming, running are not meditation. How is walking meditation different?

Can you go through all 7 purifications of insight with walking meditation. Can you also go through the 7 purifications of insight by focusing on your steps and saying to yourself "stepping, stepping"?

In the tradition of Ven. Mahasi Sayadaw, it is taught that walking and sitting meditation should be practiced balanced with one another. I am wondering where it can be found that the Buddha taught this, or how the venerable sir came to this instruction. Thank you.

Sometimes when I take a break from work and walk through a nature path, I listen to a podcast called Zencast which is a collection of hundreds of Dharma talks by dozens of teachers over the decades such as Thich Nhat Hanh and Gil Fronsdal spanning a wide array of topics, such as Five Hindrances, mindfulness, meditation, etc. I highly recommend it, it's a great way to consume teachings on an iPod. When I do this, I am present with body in nature and with mind in enlightened knowledge, but is this technically a technique for a walking meditation?