If you are looking to get in shape or just escape your connected world for a few hours, hiking is a wonderful alternative. I wanted to do hikes, but I did not want to go into the woods on my own. I was worried that I’d get lost, I’d get tired, etc. These are valid fears! But your local Sierra Club (find one near to you here) likely has excursions with excursion leaders who will help you enjoy the outing and return home safely. Getting outdoors is part of the Sierra Club Mission Statement! The idea is that, if people knew the value of wilderness, they’re more likely to protect it.
With advice and assistance from my local Sierra Club members, I did reach a level where I felt comfortable doing 5-6 mile well-marked trails alone. Today, we did an 8-mile hike on the Keg Creek section of Bartram Trail. I had not been hiking and exercising lately, so I needed that safety net. Here’s a picture when we were about 2.5 miles into the trail. We’re all still smiling. I’m the obese guy on the left. No pictures at the end. I was warmed over death at that point.