All that sitting around in airports and on airplanes can’t be that good for you. Or your health.

That’s why some airports have marked heart-healthy walking paths, others have yoga rooms for stretching and a rare few have real gyms on site.

Phoenix Sky Harbor International Airport (PHX) has the FitPHX Trail stretching more than a mile from Gate A30 to Gate D18, offering a unique view of various Phoenix area sites, including mountains, parks and man-made wonders.

San Francisco International Airport (SFO) debuted the first airport yoga room in 2012 and now has yoga rooms in Terminals 1, 2 and 3. A handful of other airports, including Chicago’s O’Hare and Midway Airports and Dallas Fort Worth International Airport (DFW) offer them as well.

Roam Fitness has a workout facility at Baltimore Washington International Airport (BWI) and several at-the-airport hotels offer day passes to their fitness areas.

Changi Airport ups the ante

With its butterfly garden, sunflower garden, free movie theaters and other unusual amenities, Singapore’s Changi Airport (SIN) goes above and beyond other airports.

When it comes to fitness, they’re doing it again.

Changi Airport now has a 5-section Fit&Fun Zone in Terminal 2 that blends fitness and entertainment.

The Green Zone has pendulum chairs overlooking the tranquil Dreamscape zone filled with plants, nature sounds and a ‘digital sky’ which changes colors depending on the time of day.

For stress relief, the Orange Zone has soft punching bags and 3-D petal structures that can be hit without boxing gloves. The Pink Zone has pull-down levers connected to weights.  The Yellow Zone has five trampoline pods, equipped with sensors that play music when travelers step inside. And the Blue Zone has a fun rope maze.