50 - 5 Challenge
Scroll down for video demonstrations of the exercises. Some movement names may be unfamiliar, but the videos show you exactly how to perform them.
The 50-5 Challenge keeps the format simple, but the work adds up fast.
You’ll alternate 50 reps of strength and conditioning exercises with 5-minute running sprints, moving between muscular work and sustained cardiovascular effort from start to finish.
The strength movements hit your upper body, lower body, and core, while the running intervals keep your heart rate elevated and challenge your ability to continue producing effort even when your heart and lungs are tired and your muscles are fatigued.
It’s a straightforward combination of strength, cardio, and endurance designed to challenge muscular stamina, cardiovascular capacity, and your ability to keep moving when your body would really like you to stop.
Why This Workout Works
The 50-5 Challenge works because it combines two different types of fatigue: muscular fatigue from the strength exercises and cardiovascular fatigue from the running intervals.
The 50-rep blocks build muscular endurance, asking your muscles to continue producing force over a longer period rather than simply completing a few heavy reps. With movements like squat presses, bent rows, and chest presses, you’re training multiple major muscle groups while your core works to stabilize and transfer force.
Then come the 5-minute sprints. These intervals elevate your heart rate and challenge your cardiovascular endurance, running stamina, and ability to recover while you’re still moving.
Alternating between the two teaches your body to transition from strength work to running and back again while fatigue continues to accumulate. That ability to maintain movement quality and continue producing effort when you’re tired is valuable for running, athletics, demanding workouts, and everyday activities that require sustained effort.
It’s not just strength. It’s not just cardio.
It’s strength + cardio + endurance working together.
Who This Workout Is For
This workout is especially well suited for:
Runners and endurance athletes who want to build strength while practicing sustained effort under fatigue.
Athletes who need to repeatedly produce force while their heart rate is elevated.
Anyone who enjoys strength + cardio workouts rather than separating the two into different training days.
Anyone looking to increase both muscular endurance as well as cardiovascular endurance.
Equipment needed: step platform, weighted bar (or dumbbells)
Exercise Demos Included: New to a movement? No problem. Click any exercise name to watch a quick video demo so you can feel confident before you start.
The Workout
Alternate 50 reps of each strength exercise with a 5-minute running sprint. Complete the workout from top to bottom.
50 Plyo Burpee Jacks
5 min Sprint
50 Squat Presses
5 min Sprint
50 Bent Rows
5 min Sprint
50 Chest Presses
5 min Sprint
How to Approach It
Choose a weight that allows you to maintain good form across the higher rep counts. Don’t let the # 50 scare you, chose a moderately heavy weight, don’t go too light. The goal is building muscular strength and endurance.
For the 5-minute runs, aim for a strong, challenging pace you can sustain for the full interval rather than going all-out at the beginning and fading significantly.
