Belly pooch has a way of showing up right around the time crowded gym classes start to lose their appeal. Between the schlep across town, the fast-paced choreography, and floor work that isn’t kind to stiff hips or sensitive knees, a lot of people over 50 step away from group fitness altogether. The trouble is that stepping away often means moving less, and moving less is exactly what leads to midsection softness and expanding waistlines.

Fortunately, ETNT is here to help. You don’t need a studio, a mat, or intense core exercises to work your core and shrink belly pooch. A sturdy chair is all you need. Seated exercises allow you to engage the deep abdominal muscles, raise your heart rate, and recruit the large muscles of your legs and glutes, all without ever getting down on the floor. And while studies show that no exercise burns fat from one specific spot, the combination of core engagement and full-body movement is what actually firms your midsection as overall body fat comes down over time.

To put this into practice, we spoke with James Brady, CPT, a certified personal trainer at OriGym, who put together five chair-based exercises that challenge your core while keeping every movement accessible and low-impact. None of them require lying down, none demand any equipment beyond a stable chair, and all of them double as functional movements that carry over into everyday life. Keep reading for the detailed instructions. Then, when you’re finished, don’t miss these 5 Morning Exercises That Trim Upper Arms Faster Than Gym Machines After 65.

Seated Knee Lifts

 

Seated knee lifts are one of the simplest ways to wake up the core while also working the hip flexors, the muscles that lift your legs with every step you take. “Because you stay seated the whole time, they’re a genuinely low-impact way to stay active, and keeping your stomach braced throughout makes the abdominal muscles work noticeably harder,” says Brady.

How to do it:

1. Sit upright toward the front of a sturdy chair with your feet flat on the floor.
2. Brace your ab muscles.
3. Slowly lift one knee toward your chest.
4. Lower it back down with control.
5. Repeat on the opposite side.
6. Aim for two to three sets of 10 to 15 reps per side.
7. Rest for 45 to 60 seconds between sets.

Seated Marches

 

Seated marches build on the knee lift by turning it into a continuous, rhythmic movement, which keeps your core engaged and gradually increases your heart rate. Alternating each knee as though you were marching forces the abdominal muscles to keep your upper body steady rather than rocking side to side. As your fitness improves, picking up the pace turns this into light cardio that also strengthens the muscles supporting everyday movement.

How to do it:

1. Sit tall in the chair with your feet flat on the floor.
2. Engage your core to keep your torso upright and still.
3. Lift one knee as though marching, then lower it.
4. Immediately lift the opposite knee.
5. Continue alternating at a steady pace.
6. Complete two to three sets of 30 to 45-second marches.
7. Rest for 45 to 60 seconds between sets.

Seated Cross-Body Knee Drives

 

This move adds rotation to the mix for an added challenge, which engages your obliques (side abs) and helps tighten and tone your core. “Lifting one knee while drawing the opposite elbow toward it works the abdominal muscles through both lifting and twisting, and it sharpens your coordination at the same time,” explains Brady. “It’s the kind of controlled, rotational movement that supports everyday tasks like reaching and turning.”

How to do it:

1. Sit upright with your feet flat and your hands lightly behind your head.
2. Engage your core.
3. Lift one knee while gently rotating your torso to bring the opposite elbow toward it.
4. Return to the starting position with control.
5. Repeat on the other side.
6. Perform two to three sets of 10 to 12 reps per side.
7. Rest for 45 to 60 seconds between sets.

Chair Sit-to-Stands

The chair sit-to-stand is the move in this routine that recruits the most muscle at once, calling on the large muscles of the legs and glutes alongside the core. “Because it works so much muscle simultaneously, it burns more energy than isolated ab work, and it directly mirrors one of the most important everyday movements: getting up out of a chair,” says Brady. “Doing it without pushing off with your hands, if you can, makes it even more effective.”

How to do it:

1. Sit toward the front of a sturdy chair with your feet flat on the floor and spaced roughly hip-width apart.
2. Flex your core and lean slightly forward.
3. Stand up all the way without using your hands if possible.
4. Lower yourself slowly back to the chair with control.
5. Aim for two to three sets of 8 to 12 reps.
6. Rest for 45 to 60 seconds between sets.

Seated Leg Extensions

 

“Straightening one leg at a time works the quadriceps, and holding your torso upright and steady throughout keeps the abdominal muscles engaged,” explains Brady. “Stronger legs paired with a more stable core make everyday activity easier, which is a big part of maintaining overall movement as you get older.”

How to do it:

1. Sit up tall in the chair with your feet flat on the floor.
2. Brace your core to keep your torso steady.
3. Slowly straighten one leg out in front of you.
4. Pause for one to two seconds at the top of the movement.
5. Lower your leg back down with control.
6. Complete two to three sets of 10 to 12 reps per side.
7. Rest for 45 to 60 seconds between sets.

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