Why Every Climber Should Try Our HIIT + Core Class

Ever wish you could climb harder without spending more hours on the wall? Adding the right cross-training can boost the strength, power, and endurance you rely on every session. One of the most efficient options is a group fitness class focused on high-intensity intervals and core strength.

If you’re a frequent visitor at one of the Climbing Collective gyms in Loveland, Greeley, or Longmont—or a local Coloradan looking to climb stronger—you should try Climbing Collective’s HIIT + Core class.

Class schedule and locations

The hour-long HIIT + Core class is offered at Climbing Collective’s Longmont and Greeley locations:

Longmont

• Sundays, 8:30–9:30 AM with Kylie

Greeley

• Tuesdays, 6:30–7:30 PM with Kaylee

All Climbing Collective memberships include free access to fitness classes. You’ll need an All Access Membership to attend classes at both locations. If you have a single-gym membership, you can still attend by purchasing a day pass or punch pass at the other facility.

What is a HIIT + Core class?

The HIIT + Core class combines heart-pumping cardio intervals with targeted core exercises, tailored by your instructor to match your experience level. Understanding the basics of HIIT and core training makes it clear why this combo is so powerful for climbers.

High-Intensity Interval Training (HIIT)

HIIT (High-Intensity Interval Training) is a workout format that alternates short bursts of near-maximal effort with periods of rest or low-intensity movement. Based on evidence of the effects, HIIT is especially effective at increasing VO2 max.

VO2 max represents the maximum volume of oxygen your body can use during exercise. The higher your VO2 max, the better your cardiovascular fitness. HIIT can improve VO2 max by:

• Increasing stroke volume – how much blood your heart pumps per beat.

• Maximizing cardiac output – how much blood your heart pumps per minute.

• Improving a-vO2 diff – how much oxygen your tissues extract from the blood.

• Boosting skeletal-muscle oxidative enzyme capacity – how efficiently your muscles use energy.

• Increasing capillary density and red blood cell volume – how much oxygen is available to your muscles and how well your body can transport it.

Why HIIT helps climbers

Rock climbing is primarily a strength and power sport—you can be a strong climber without elite cardio. But improving your VO2 max gives you a bigger engine to support that strength.

For climbers, that can mean:

• Training harder and longer before fatiguing

• Recovering more quickly between burns or hard sequences

• Feeling less pumped on long or sustained routes, especially for rope climbers

HIIT is also time-efficient. If you struggle to fit training around work, school, or family, a one-hour class offers a high return on time invested. One to two classes per week for 3–4+ months can deliver noticeable improvements.

The group setting at Climbing Collective adds accountability and motivation. Your instructor and classmates help you push through challenging intervals, making it easier to stay consistent and get the most out of each session.

Beyond performance, VO2 max is linked to long-term health: higher values are associated with lower disease risk and better overall longevity. Investing in your cardiovascular fitness supports both your life on the wall and your life off it.

Core training 101

Core training goes far beyond visible six-pack abs. Your “core” is a network of muscles that stabilize your spine, transfer force, and keep you moving efficiently. Key players include:

• Transverse abdominis – deep abdominal muscles that stabilize your spine.

• Rectus abdominis – the classic “six-pack” muscles that allow you to bend forward.

• Internal and external obliques – lateral muscles that help you twist and side-bend.

• Pelvic floor muscles – support your pelvic organs and create a base for other core muscles.

• Diaphragm – the primary breathing muscle that helps maintain intra-abdominal pressure.

• Multifidus – deep spinal muscles that control movement between vertebrae and protect your spine.

• Erector spinae – back muscles that help you stand tall and control extension.

• Quadratus lumborum – deep core muscles that support lateral bending and trunk stability.

• Glutes – powerful hip muscles that provide stability, balance, and a foundation for your entire core.

Building strength in these muscles improves your stability, control, and power in almost every movement you make. It’s also critical for preventing injuries, especially in the lower back and hips.

Why core strength matters for climbers

Core strength can be the difference between being one of the strongest climbers in the gym and feeling stuck in the middle of the pack. On the wall, your core plays three crucial roles: body tension, control, and injury prevention.

• Body tension: This is the coordinated generation of internal force (from your muscles) to overcome external forces like gravity. A strong core helps you resist swinging, sagging hips, and barn-dooring, so you stay connected to the wall.

• Control: Good core engagement lets you move with precision—deadpointing, flagging, and locking off with more stability, especially on steep or powerful climbs that demand constant body tension.

• Injury prevention: A strong, well-trained core stabilizes and protects your spine while supporting the wide variety of body positions climbing requires. When your core is weak, other tissues—muscles, tendons, and ligaments—take on extra load, increasing the risk of both acute injuries and chronic pain.

Try Climbing Collective’s HIIT + Core class

If you want to improve your strength and cardiovascular fitness without adding hours to your training schedule, Climbing Collective’s HIIT + Core class is a smart place to start. Led by knowledgeable instructors, each session challenges you with high-effort intervals and targeted core work, balanced by intentional rest periods.

By the end of the hour, you’ll feel accomplished—not wrecked—and better prepared for your next climbing session.

If you’re ready to give it a try, sign up here. When you register, make sure you select the Climbing Collective location where you want to take class.

Already taken a HIIT + Core class at Climbing Collective? Comment below and share what you noticed in your climbing after a few weeks of consistent class attendance!