Millions of Americans earn their living from behind a desk and computer screen, and while that's a reality only likely to expand over the coming years, hundreds of nondesk jobs continue to grow and thrive, according to a new analysis of labor market data from CareerBuilder.

Ninety percent of the 20 highest paying nondesk jobs are in health care and most require a doctoral or professional degree, according to the analysis. Many of the fast-growing nondesk jobs, however, do not require a 4-year degree or higher, and several offer workers a direct path to the middle class in a variety of industries.

The data for the analysis was provided by Economic Modeling Specialists Intl. (EMSI)–CareerBuilder's labor market data arm that pulls from more than 90 government and private resources.

For this study, nondesk jobs are defined as any occupation where the majority of the average worker's time spent on the job would be away from a desk. Many occupations have core responsibilities split between a desk/office and non-stationary or field work—e.g. engineering occupations, power plant technicians/operators, real estate brokers, etc. Those occupations were not included in this analysis.

"The U.S. workforce has gradually shifted to office-based work due to the rise of the professional services economy and productivity gains associated with information technology," said Rosemary Haefner, chief human resources officer at CareerBuilder. "But some of the healthiest areas of job growth year-after-year are in middle-skill occupations that don't require workers to sit in front of computer monitors and phones for 40-hours a week."

Haefner states that while they tend to pay less than desk jobs on average, occupations that require workers to move around provide real benefits. A 2014 CareerBuilder/Harris Poll survey found that workers in nondesk jobs were two times less likely to complain about their work environment and significantly less likely to report being overweight.

In all, there are 170 nondesk occupations that pay $15 per hour or more on average, do not require a 4-year degree for a typical entry-level position, and have seen six percent job growth from 2010-2014. The following table shows the top-paying nondesk occupations in various categories. 

*Avionics technicians inspect and repair various aircraft equipment, such as radar, radio and navigation systems.

For more information on work environments, see the BLS's Occupational Outlook Handbook.