Deep concentration or one-pointed focus favours a state of [B]deep relaxation[/B]. This is what hatha yoga is for,really.
In ordinary life, some folk are in some sense deeply concentrated but not relaxed which means they cannot go so deep and it gets in the way.There’s a simultaneous letting go(relaxation- conscious ,and unconscious) and a one-pointed focus of mind(concentration) in some or many meditational approaches…
So effective meditation can occur when relaxation is coupled with concentration, if we wish to use that term,bearing in mind there is no kind of strain or effort.It is an effortless thought-free state;such a state induces the bliss experience.It is is said that thought based awareness is like a corruption of our natural state- some have called this ‘pure bliss conciousness’. Because our thoughts are like perversions- they are constructs- we only give them meaning by conjuring them up etc.In the end they colour our perception and ultimately can cloud our experience because we are more than mind but also beyond mind.And there is not too much effort because effort gets in the way of effective concentraton;ideally it is effortless in true meditation-(limbs 7 & beyond).It becomes that way;everything in theory dissolves into undifferentiated Oneness, or Cosmic Unity.
I just thought the relaxation component is worth mentioning as most folk are not truly relaxed mentally and physically,emotionally etc but fortunately we have hatha yoga to try and sort that out…
hi yulaw ,If you’re thinking about (deep) meditation practice,pratyahara,(limb 5) is major facilitator of that- when we introvert the senses and we can remain relaxed on al levels-i.e the inner noise recedes ,the stories about us and our emotions and past quieten, the bodily tensions are removed we can go deeper unhindered without the usual typical obstacles.Some techniques facilitate that better than others and may use different approaches,some in combination.But i would put some stress on that limb as a major helper in that process of going deep(into ourselves) without which, with any effort in meditation or indeed most of yoga practice, there would be the usual distractions that bother people.