Dale 'Grey Beard' Sanders reclaims title as oldest person to thru-hike the Appalachian Trail at 91

In case you were feeling particularly productive and accomplished today, a man named Dale "Grey Beard" Sanders is about to humble you.

At 91-years-old, Sanders officially reclaimed his title Monday as the oldest person ever to complete a thru-hike of the Appalachian Trail, finishing his journey atop Mount Katahdin in Maine .

And before we go any further, understand that hiking the Appalachian Trail is an extraordinary feat for any hiker — let alone someone with nine decades under his belt.

CLICK HERE FOR MORE COVERAGE FROM OUTKICK OUTDOORS The AT stretches roughly 2,200 miles from Springer Mountain in Georgia to Katahdin in Maine, crossing 14 states along the way.

According to the Appalachian Trail Conservancy, hikers who complete the whole thing experience about 464,500 feet of elevation gain— and an equal amount of loss.

That combined 929,000 feet of elevation change is equal to going from sea level to the top of Mount Everest and back roughly 16 times.

And here I was proud of myself for taking the stairs at the airport.

The distance alone is obviously absurd, but mileage is only part of what makes the AT such a beast.

Unlike some long-distance trails that offer extended stretches of relatively forgiving terrain, the AT spends much of its length going relentlessly up and down the Appalachian Mountains.

Hikers contend with steep climbs, boulder fields, exposed roots, mud, stream crossings and rocks upon rocks upon rocks.

CLIMBING EL CAPITAN WHILE NEARLY BLIND: WHY EITAN ARMON REFUSED TO SIT AROUND WAITING FOR A CURE Then you reach New Hampshire's White Mountains and Maine, where the trail gets particularly rude.

Southern Maine and the Whites are considered among the most difficult portions of the AT, with steep ascents and descents and rugged terrain.

And before hikers can officially call themselves finishers on a northbound journey, they still have to deal with Katahdin — a mountain that requires more than 4,000 feet of climbing and stretches of scrambling over boulders and ledges.

Consider that the grand finale.