Exercise guide
Side Step Rainbow Arms
- Intermediate
- Compound
- Rep-based
- Shoulders
- Upper arms
This dynamic compound movement combines a lateral step with a large overhead arm arc to engage the core, shoulders, and lower body simultaneously. It improves coordination and lateral stability while targeting the quads, deltoids, and chest through a fluid, rhythmic motion.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Stand upright with feet hip-width apart, positioned to the side of a low step or platform.
- Keep your arms relaxed at your sides and maintain a neutral spine with shoulders pulled back.
- Engage your core and keep your gaze forward to prepare for the lateral movement.
How to do it
- Step one foot laterally onto the center of the step, bending the knee slightly into a shallow lunge while keeping the trailing leg straight.
- Simultaneously sweep both arms out to the sides and overhead in a large 'rainbow' arc, exhaling as your hands meet at the top.
- Inhale as you push firmly off the step to return to the starting position, lowering your arms back to your sides with control.
- Repeat the movement by stepping with the opposite foot, alternating sides with a steady, fluid tempo.
Form checklist
- Keep your chest lifted and avoid leaning your torso too far forward during the step.
- Ensure the knee of the stepping leg stays aligned with your toes and does not cave inward.
- Maintain a tight core to prevent your lower back from arching as your arms reach overhead.
- Land with your full foot on the step to ensure stability and proper calf engagement.
Pro tips
- Focus on a full, wide range of motion with the arms to maximize engagement of the deltoids and pectorals.
- Imagine 'pushing the step away' with your foot to increase the explosive power and activation of the quadriceps.
- Keep the movement continuous and rhythmic to turn this into an effective cardiovascular and coordination challenge.
Make it harder
- Increase the height of the step to deepen the lateral lunge and increase the workload on the quads and glutes.
- Hold light dumbbells or wrist weights to add resistance to the arm arc, further challenging the shoulders and core stability.
Frequently asked
- What muscles does the side step rainbow arms work?
- The side step rainbow arms primarily targets the calves and quadriceps, and also works the serratus anterior and trapezius as secondary muscles.
- What equipment do you need for the side step rainbow arms?
- The side step rainbow arms requires no equipment — just your body weight.
- Is the side step rainbow arms good for beginners?
- The side step rainbow arms is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.
Related exercises
- Air Punches MarchBeginner · calves, pectorals, and quadriceps
- Barbell Power JerkAdvanced · adductors, calves, deltoids, glutes, hamstrings, and quadriceps
- Barbell Snatch From BlocksAdvanced · adductors, calves, glutes, hamstrings, lats, quadriceps, serratus anterior, and trapezius
- Basketball Shot JumpAdvanced · calves, glutes, and quadriceps