Yoga Nidra is a form or meditation also know as "Yogic Sleep".
It is practiced lying down and consists of several stages that allow the practioner to enter a state between waking and sleeping. It is extremely relaxing.
Yoga Nidra meditations are usually at least 20 minutes long, but can go much longer.
The practice has been widely researched and has been found to help with Post Traumatic Stress Disorder (PTSD). A form of Yoga Nidra called IRest is being used by the US military for treating PTSD.
I strictly use secular language in all my meditations.
Metta meditation is also known as Loving-Kindness Meditation and involves a repeated focus on compassion and loving-kindness with ever increasing difficulty as to who you focusing your meditation on. It starts with oneself, people closest to us and finally human beings we might consider as least deserving of our compassion.
Some research has shown that Metta meditation can increase positive emotion, but more research needs to be done.
In my experience, Metta meditation has allowed me to feel more connected to others and clients have reported a decrease in social anxiety.
Mindfulness is the awareness of the present moment and what is around us. It can be called meditative but is more a practice for grounding, slowing down and being more present in life.
Mindfulness can be practiced in many different ways, by engaging all our senses during eating, being aware of all that is around us on a walk (e.g. the sound of our steps, the wind on our skin) and during body scans.
You can listen to one of my body scans here.
Guided visualizations are expercises where the you are guided through a scene or experience with imagery or being prompted to visualize certain images, experiences or places.
I use a variety of guided visualizations as part of my coaching practice, in particular for reconnecting with your authentic self, gratitude and appreciation, as well as exploration of sub-conscious processes.
Here is an example of a guided visualization. I fact, it is one of my most popular ones.