HIIT gear that actually matters: kettlebells, jump ropes, and more

I got into HIIT because I needed a way to get a hard conditioning session done in 20 minutes on days when I didn’t have time for a full ride or run. The first few sessions I just used bodyweight exercises and a stopwatch app. That worked for a while, but once I added a kettlebell and a jump rope, the workouts got significantly better. More variety, more intensity, and my upper body stopped being the weak link it had been for years.

You don’t need much gear for HIIT, which is most of the appeal. My filter for what earns a spot: it has to be ready in two seconds, because anything that slows down a transition kills the intensity. A kettlebell sits on the floor loaded. A jump rope takes one motion to pick up. A plyo box never needs adjusting. The second filter, since I do this as cross-training for triathlon, is that it can’t beat up my legs so badly that the next day’s run suffers. Swings and rope work pass that test. Heavy barbell squats done for time do not.

The four things on my garage floor

REP Fitness Cast Iron Kettlebell, $45-90

A kettlebell is the single most useful piece of HIIT equipment I own. Swings, goblet squats, cleans, snatches, Turkish get-ups. Each movement is explosive and compound, which means your heart rate climbs fast and stays there. A 20-minute kettlebell circuit will humble you in a way that most machine-based cardio can’t.

REP’s cast iron bells have a textured matte finish that grips well without tearing up your hands during high-rep sets. The handle is wide enough for two-handed swings and smooth enough that it doesn’t chew up your calluses. They’re gravity-cast, which means consistent weight and no voids in the iron.

Start with 16kg (35 lbs) if you have some training experience, or 12kg (26 lbs) if you’re newer to kettlebells. You’ll want to go heavier eventually, but a single bell in that range covers most HIIT programming for months.

WOD Nation Speed Jump Rope, $17

Jumping rope sounds basic until you try doing it for three minutes straight after a set of kettlebell swings. It’s one of the best conditioning tools that exists, it costs less than a pizza, and it fits in your gym bag. I use mine as a warm-up before lifting and as active recovery between harder intervals.

The WOD Nation rope uses a bearing system in the handles that lets the cable spin freely, which matters for speed work and double-unders. The cable is adjustable for height and comes with a spare. At $17, you could buy three of these for the price of a single name-brand rope and you’d still have money left over.

If you’re doing HIIT outdoors on concrete, get a rope mat or use it on a gym floor. The coated cable wears through fast on rough surfaces.

REP Fitness 3-in-1 Wood Plyo Box, $100

Box jumps and step-ups are HIIT staples because they demand explosive leg power and drive your heart rate up in a single rep. A 3-in-1 box gives you three height options (typically 20/24/30 inches) by flipping it on different sides. That’s enough variety for most people without needing multiple boxes.

REP’s wood plyo box is CNC-machined from 3/4” plywood, so the panels fit together tightly and the box doesn’t wobble when you land on it. The surface is sanded smooth, which matters when you’re doing box jumps in shorts and don’t want to scrape your shins on a rough edge. Assembly takes about 15 minutes with a power drill.

One note: wood boxes hurt if you miss. Foam-covered plyo boxes exist and are gentler on failed reps, but they’re also twice the price and less stable. If you’re confident in your jumps, wood is the better value.

Polar H10 Heart Rate Monitor, $90

If you’re doing HIIT by feel, you’re probably either going too hard or not hard enough.

A chest strap heart rate monitor tells you exactly where you are in each interval, which lets you calibrate your effort. Work intervals should push you to 85-95% of max HR. Recovery intervals should drop you to 60-70%. Without data, you’re guessing.

The Polar H10 is the most accurate consumer HR monitor I’ve used. It pairs with basically everything: Garmin, Apple Watch, Peloton, Strava, Polar’s own app. Dual Bluetooth and ANT+ connectivity means you can send data to your watch and your phone simultaneously. Battery lasts about 400 hours.

The strap is comfortable enough that you forget it’s there after the first few minutes. Just wet the sensor contact points before putting it on, otherwise it takes a while to pick up your heart rate.

Start with the bell and the rope

That combination runs $60-110 depending on the bell weight you pick, and it covers months of programming. Swings and rope intervals alone make a 20-minute session you’ll dread in the good way.

Add the plyo box when you get bored or want more explosive leg work. The Polar H10 comes last, once you’re consistent enough that guessing at effort starts to bug you. For me that happened around month three.

The whole setup costs under $300 and lives in one corner of the garage. An exercise bike costs twice that and does exactly one thing.