Workout Description

Why This Workout Is Medium

Two 4-minute AMRAPs on a calorie machine is straightforward metabolic conditioning with built-in recovery. The 4-minute work intervals are short enough to maintain high intensity without severe fatigue accumulation, and the 4-minute rest between rounds allows meaningful recovery. The limiting factor is purely aerobic capacity and work rate—no skill, no load complexity, no movement interference. Average CrossFitters can sustain high output for 4 minutes and recover adequately. Total time commitment is manageable (~16 minutes). This is challenging but not overwhelming.

Training Focus

This workout develops the following fitness attributes:

• Endurance (9/10): Two 4-minute AMRAPs on a calorie machine demand sustained cardiovascular output at high intensity. The short rest between rounds limits aerobic recovery, testing true aerobic capacity and work capacity.
• Speed (9/10): Rapid cycling and quick transitions between rounds are essential. The AMRAP format with minimal rest demands maximum speed and quick recovery between intense efforts.
• Stamina (8/10): Continuous machine work for 4 minutes requires significant muscular endurance of legs and core. The repeated effort in round two, despite fatigue, heavily taxes muscular stamina systems.
• Power (8/10): Maximizing calories requires explosive leg drive and rapid pedal/rowing cadence. Power output directly correlates with calorie accumulation, making this a power-focused stimulus.
• Strength (1/10): Calorie machines require minimal absolute strength. Movement is primarily about power output and muscular endurance rather than maximum force production against heavy loads.
• Flexibility (1/10): Seated machine work demands only basic hip and knee range of motion. No complex movement patterns or extreme mobility requirements are present.

Movements

• Calorie Bike

Scaling Options

No scaling is needed for machine selection — all athletes can perform this workout regardless of fitness level. Adjust effort, not the workout. Beginners should still go hard but may aim for a sustainable 80-85% effort rather than a true sprint, to avoid complete breakdown of mechanics. Athletes with limited upper body capacity can choose the assault bike or echo bike to offload upper body stress. If the 4-minute AMRAP feels too long for true sprint output, reduce to 2 x AMRAP 3 mins with 3 mins rest to maintain the sprint stimulus. Athletes with lower body injuries can sub ski erg or rowing with arms-only.

Scaling Explanation

There is no scaling needed for most athletes on this workout — the machine self-regulates effort. Scale the time domain only if an athlete is truly unable to sustain sprint intensity for 4 minutes, which would shift the stimulus away from power toward endurance. The goal is maximum calories, meaning intensity is the entire point. Prioritize full effort over perfect mechanics here — technique naturally simplifies at high output on machines. Any athlete who finishes round one and feels they could have gone harder must push harder in round two. The target is a total calorie score that reflects genuine max effort across both rounds.

Intended Stimulus

This is a pure sprint-interval workout demanding maximum short-burst power output. Each 4-minute window should feel like an all-out effort — lungs burning, legs screaming, and your mind fighting to hold on. The 4-minute rest is generous by design, allowing near-full recovery so you can truly sprint both rounds. The primary challenge is mental: pushing past the discomfort and matching or beating your first round score. Expect cardiovascular and muscular fatigue to peak around the 2-3 minute mark of each interval.

Coach Insight

Choose your machine based on your strengths — assault bike, rower, ski erg, and echo bike all work. Go out fast but controlled in the first 30 seconds to find your sprint pace, then commit fully. Aim for a pace that feels unsustainable but holds together — this is NOT a pace workout. On the rower or ski erg, drive powerfully through each pull and don't sacrifice stroke rate for length when fatigued. On the bike, keep cadence high and drive with the legs. Track your calorie count at the 2-minute mark and use it as a target to beat in round two. Rest fully during the 4 minutes — stand, breathe, shake out your legs, and mentally reset. Your round two score should be within 2-4 calories of round one.

Benchmark Notes

Primary limiters are aerobic capacity and power output on the machine; the 4-min rest largely restores effort so round 2 is close to round 1, making total calories a clean measure of sustained engine. L5 (~95 total cals) reflects a mid-level CrossFitter averaging roughly 47–48 cals per 4-min effort on an Assault Bike or rower.

Modality Profile

Calorie Bike is a monostructural cardio movement. It is a cyclical, continuous effort on a stationary bike, which falls entirely under the Monostructural (M) modality.