Depending on what skillset you have, jumping in the air has its time limitations.
Journalist at ShortList Towers? Little over a second. Olympian high jumper? Just under three. NBA basketball player? Oh about five days.
And should you be in the market for a device to tell you just how giant your giant leap is, look no further than the Vert, a compact device designed to measure air-time using high-precision gyroscope and accelerometer read-outs which feed onto an OLED display.
Packing a lot into a small device, it's a world away from the bulkier gadgets we've come to associate with 'jump testing', designed to be worn around the waist or hook on to a person's clothing via a clip or hidden inside a specially-designed belt.
Any budding track stars might want synch it with a smartphone or iPad using Bluetooth 4.0 or App connections - you know, enabling them to share information straight after practice. Prices start from £80.
Make 2015 your leap year.