This ~44-minute sequential aerobic grind creates brutal cumulative fatigue: the bike pre-fatigues the legs before the run, and a sub-6-minute mile row (~1:50/500m pace) after both is genuinely punishing. The final RFT introduces double unders requiring coordination under significant respiratory and leg fatigue. No heavy loads or high-skill gymnastics, but the relentless cardio volume across four modalities makes this solidly Hard.
This workout develops the following fitness attributes:
5 total movements: BikeErg, Run, and Row are all Monostructural (3/5 = 60%), while Double-Unders and Burpees are Gymnastics bodyweight movements (2/5 = 40%). No external load movements present.
| Attribute | Score | Explanation |
|---|---|---|
| Endurance | 9/10 | Four miles of biking, 1.75 miles of running, and a full mile row back-to-back create a sustained multi-modal aerobic challenge totaling nearly 45 minutes of continuous cardiovascular output. |
| Stamina | 8/10 | High-volume sustained effort across rowing, running, and cycling taxes full-body muscular endurance. The 50 burpees and 100 double unders in the RFT add meaningful upper and lower body muscular stamina demands. |
| Strength | 1/10 | No external loading present. All movements are bodyweight or machine-based, making this nearly zero in terms of maximal force production requirements. |
| Flexibility | 2/10 | Basic mobility needed for burpee hip extension and rowing catch position. No extreme ranges of motion demanded across biking, running, rowing, or jump rope work. |
| Power | 3/10 | Double unders require rhythmic calf and wrist power, and burpees include a small explosive jump. However, the dominant stimulus is aerobic, not explosive, minimizing power as a primary driver. |
| Speed | 4/10 | The 5 RFT piece rewards fast double under cycling and burpee transitions. The bike, run, and row segments require pacing strategy rather than all-out sprint efforts, creating moderate speed demand overall. |
4 Mile bike - 19:551.75 Mile run - 12:561 Mile Row - 5:535 RFT: - 5:1320 double unders 10 burpees
