The idea for the show originated three years ago, when Madeline Hooper had an aching neck and shoulder. Despite the discomfort, Ms. Hooper, a retired public-relations professional who has been gardening in the Hudson Valley for many years, was still outside several hours each day doing what she loved. A friend suggested that she see Jeff Hughes, who had assisted him two years previously.

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Matthew Larkin’s topiary collection at Black Barn Farm, in the Berkshires of Massachusetts, is one of the gardens featured on “GardenFit.” Topiary requires lots of shearing, and Mr. Hughes encouraged Mr. Larkin to vary his chores, not doing any one activity for more than about 30 minutes at a time, to avoid repetitive stress injuries.

Matthew Larkin’s topiary collection at Black Barn Farm, in the Berkshires of Massachusetts, is one of the gardens featured on “GardenFit.” Topiary requires lots of shearing, and Mr. Hughes encouraged Mr. Larkin to vary his chores, not doing any one activity for more than about 30 minutes at a time, to avoid repetitive stress injuries. Credit… Paul Rocheleau

Matthew Larkin’s topiary collection at Black Barn Farm, in the Berkshires of Massachusetts, is one of the gardens featured on “GardenFit.” Topiary requires lots of shearing, and Mr. Hughes encouraged Mr. Larkin to vary his chores, not doing any one activity for more than about 30 minutes at a time, to avoid repetitive stress injuries.

Mr. Hughes has been a personal trainer for 35 years, with workplaces in Los Angeles, New York City, and now not far from Ms. Hooper since 2004. Their workouts also helped reduce her discomfort; she realized that what they were doing could benefit all of her gardening friends.