Mindfulness training outcomes are underpinned by research

Improved focus and attention

Even people who are new to meditation, meditating just 10 minutes a day can experience an improvement in attention
Brief Mindfulness Meditation Improves Attention in Novices: Evidence From ERPs and Moderation by Neuroticism
Front Hum Neurosci. 2018; 12: 315.
Published online 2018 Aug 6. doi: 10.3389/fnhum.2018.00315

People who who meditate regularly experience lasting improvement in attention and focus.
Maintenance of Attentional Improvements Following Meditation Training
Journal of Cognitive Enhancement, September 2018, Volume 2, Issue 3, pp 259–275

A short training course in mindfulness improves children's ability to ignore distractions and concentrate better.

Study carried out by Dominic Crehan and Dr Michelle Ellefson , University of Cambridge being presented on 6 September 2013, at the British Psychological Society's Cognitive Developmental Psychology Annual Conference

Greater Calm and well-being

People at work experience greater well-being, less stress and burn-out and performed better following mindfulness training
A Workplace Mindfulness Intervention May Be Associated With Improved Psychological Well-Being and Productivity. A Preliminary Field Study in a Company Setting
Front Psychol. 2018; 9: 195.
Published online 2018 Feb 28. doi: 10.3389/fpsyg.2018.00195

Less Stress and Anxiety

A meta-study looking at the outcomes of many research papers concludes that mindfulness training offers many benefits including less stress and anxiety
What are the benefits of mindfulness: A wealth of new research has explored this age-old practice.
By Daphne M. Davis, PhD, and Jeffrey A. Hayes, PhDJuly/American Psychological Association August 2012, Vol 43, No. 7 Print version: page 64

Nurses manage stress better following mindfulness training
The Effect of Meditation on Physical and Mental Health in Junior College Students: A Quasi-Experimental Study
Yang, Ke-Ping; Su, Whei-Ming*; Huang, Chen-Kuan** Journal of Nursing Research: December 2009 - Volume 17 - Issue 4 - p 261-269 doi: 10.1097/JNR.0b013e3181c17f77