The company offers a portfolio of mobile-based psychological fitness tools that help people develop mental and emotional strength and resilience to stress.

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The combination of positive stress on bone from aerobic and strength training leads to stronger, denser and more functional bone.

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Landry and Kling told me they pride themselves on their resiliency, crediting their ability to turn on a dime in adjusting to business issues, and the strength of their personal partnership in dealing with the inevitable personal stress points from weddings to sudden illnesses and beyond.

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The ability to recover quickly: Stress and surprise create a need for the executive athlete to have the strength to recover and resume: this can be conditioned through physical and mental practices that can be performed within the workplace and at home.

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That gives the material strength, as there are fewer places for stress to build up and fractures to form than in hydroxyapatite made haphazardly of larger, more heterogeneous grains.

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Both Mr Powell and the Turkish prime minister, Recep Tayyip Erdogan, have been at pains in recent days to stress the underlying strength of the alliance between the two countries.

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