By some estimates, the effects of manual material handling represent the biggest single contributor to worker injury in the United States.
According to the 2010 Liberty Mutual Workplace Safety Index, overexertion injuries (which include injuries related to lifting) are the most disabling of all workplace injuries, accounting for $13.4 billion in direct costs. In 1991, NIOSH (The National Institute of Occupational Safety and Health) developed the NIOSH Lifting Equation to “assist in the identification of ergonomic solutions for reducing physical stressors associated with manual lifting.” This model has been widely used by industrial safety professionals since its creation. Now you can take it with you.

The certified professional ergonomists (CPEs) at Humantech developed htLiftCalc to quickly and easily perform the NIOSH Lifting Equation whenever and wherever you need it. It is available for use in both metric and standard measurement. You can use this application at the job site to evaluate both existing and proposed lifting conditions to determine the Recommended Weight Limit (RWL) of a specific job or task. It can also help you prioritize hazardous jobs that require ergonomic intervention. htLiftCalc is copyright of Humantech, Inc.
It is formulated according to the work of Thomas R. Water, PhD; Vern Putz-Anderson, PhD; and Arun Garg, PhD of NIOSH as described in the Applications Manual for the Revised NIOSH Lifting Equation (NIOSH, January 1994).

http://itunes.apple.com/us/app/ht-niosh-lift-calculator/id447112695

With this application you’ll know how good your body fat content. You can find out if it is above or below the weight recommended by WHO.
The Body Adiposity Index (BAI) is a new method to measure the amount of fat in the body proposed by the team physiologist Richard Bergman, University of Southern California (Los Angeles), published in March 2011 the journal Obesity.
The height and extent of the hips of an individual is used to point out who is above or below the ideal weight. The greater the circumference of the hips, the greater the change of the same being overweight.

http://itunes.apple.com/nl/app/bmi-bai-calculator/id428844286