Fabiana Buontempo for Insider Holding each plank for a total of 90 seconds was enough for me to feel the burn.Although it wasn't a strenuous workout day, my abs felt really strong.I started at a slow pace and then picked up the intensity to turn my jog into a sprint.

Since Markle once told I was getting bored of these runs and my legs hurt, but I was still disappointed in myself because I stopped to walk a few times.

Kate Hudson/Instagram Even an adorable toddler can't get between Kate Hudson and her workouts! I woke up with sore legs this morning, which made me believe riding that bike was a tougher workout than I'd thought.

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I decided I would focus on my abs today since, according to a Harper's Bazaar from 2019, Middleton is a fan of doing I wanted to choose exercises that targeted each part of my core so I did regular crunches, oblique crunches, and I attempted knee-tuck crunches on the stability ball, which were a bit of a fail.I was quickly reminded of why I usually avoid using a stability ball: Any ab exercise performed on it is very challenging.I did my best to get through three sets of 20 for each exercise and my abs were burning by the time I was done with my third set.

Fabiana Buontempo for Insider

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The sliding motion in After doing one set of each exercise, I moved on to work my upper body and core.

At this point, I felt like my muscles were fatiguing pretty quickly.

I did the same rep count as the other exercises for my bent-over rows.To target my lower back, I laid on my stomach and did the superman exercise which is lifting your arms overhead and legs off the ground at the same time.Although I was really over the royal-inspired runs at this point, I forced myself to run for 3 miles around my neighborhood.

“Morning yoga with my little monkey,” Hudson said of the pair's workout