The training has been growing in popularity in recent years, with the NHS recommending it as a way to reduce stress and anxiety.
An eight week trial by researchers including those of University of Westminster in the UK, showed it was better than gardening and yoga at helping people to relax.
For the research 68 people were recruited. A third of then met every week for group gardening and conservation activities, another group tried weekly yoga sessions, while the third group practiced 10 minutes of meditation practice each day.
While yoga saw only a slight improvement, gardeners CAR jumped by 20 per cent, while the mindfulness group saw their cortisol awakening response leap by 52 per cent.
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Those who enjoyed meditation gained an even bigger boost, with CAR rising to 78 per cent, 'The Telegraph' reported.
Previous studies have shown that mindfulness can decrease self-reported stress levels and make people feel calmer.
Last year US scientists proved for the first time that it can help lower inflammatory molecules and stress hormones.
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