These Workouts Left Me So Sore . . . and They're All From Instagram

This cardio circuit consists of five moves like star burpees and explosive lunges. Katie suggests doing five rounds, but know that three rounds was enough for me (my arms, legs, and lungs were working hard).

Squat pulses will be the death of me, but this workout is a great way to feel your glutes burn. Make sure you're engageing your core, especially during those overhead squats.

My quads burned right after the first round (I blame the side-lunge sumo squats). Even though you're just doing eight to 12 reps of each exercise, four rounds is HARD. Tip: write out the exercises and reps on a piece of paper so you remember the order.

All of these are bodyweight moves, except for the standing obliques (I used a 6- or 8-kilogram kettlebell for those). There are nine exercises in total per round, so I would suggest writing this out as well. Oh, and make sure your form doesn't break during those planks!

Get ready for four rounds that will work your core, arms, and legs (I felt it in my shoulders big time). I used two eight-pound dumbbells and my trusty booty band. Tip: download a Tabata timer to help you keep track of the "40 seconds on, 20 seconds off" format.

I've been following the SugarySixPack Instagram account for years now, and this is by far my favourite full-body workout she's created. All you need is a pair of dumbbells. If you're not sure which weight you should be using, we've got you covered.

NASM-certified trainer and POPSUGAR assistant fitness editor Tamara Pridgett created this kick-butt workout. The pistol squat jumps and clapping push-ups may deem challenging for some people (me), so feel free to modify those.