Single‑Leg Strength Training: The Unilateral Advantage
Strength training is widely accepted as beneficial for cyclists. But how that strength is built matters more than most athletes realize.
Over the last decade, multiple studies have pointed toward the same pattern:
Unilateral (single‑leg) strength training consistently transfers better to cycling performance than bilateral lifting alone.
A 2022 study by Ji et al. adds to that growing evidence—and the results are hard to ignore.
The Study
Researchers followed 24 trained cyclists and triathletes (VO₂max ≈ 60) over 10 weeks.
All athletes trained similarly on the bike (~6 hrs/week). The only difference was gym work (2 sessions per week):
Unilateral Gym (UG): Single‑leg leg press, leg extension, leg curl (4×4–10RM per leg)
Bilateral Gym (BG): Same exercises, same volume, just performed with both legs together
Control: No strength training
Performance Outcomes
⏱ Time to Exhaustion @ 105% of LT2
+67% — Unilateral
+43% — Bilateral
+37% — Control
⚡ 15‑Second Sprint Power
+20% — Unilateral
0% — Bilateral
−6% — Control
The unilateral group was the only group to significantly improve both endurance capacity and sprint power.
This isn’t an isolated result
Ji et al. (2022) aligns with a broader research base showing that single‑leg strength training improves cycling‑specific performance variables.
Some key examples:
Rønnestad & Mujika (2014) demonstrated that heavy strength training improves cycling economy and power, especially when exercises closely match sport demands.
Maffiuletti et al. (2016) showed unilateral strength training produces greater neural adaptations and reduces bilateral force deficits, which are highly relevant for alternating‑leg sports like cycling.
Beattie et al. (2017) reported that single‑leg strength work improves force application symmetry and neuromuscular efficiency in endurance athletes.
Across studies, the mechanism is consistent: greater neural drive, better limb‑specific force production, and improved coordination.
Why Unilateral Training Transfers Better
Cycling is an alternating, single‑limb task. Each leg produces force independently.
Unilateral training:
Improves inter‑limb coordination
Reduces left–right strength asymmetries
Enhances neural recruitment per leg
Increases force production without excessive spinal loading
Places higher demands on hip stability and trunk control
Bilateral lifts can build general strength, but unilateral lifts improve how that strength is expressed on the bike.
Practical Takeaways
Evidence‑backed unilateral staples include:
Single‑leg leg press
Bulgarian split squats
Single‑leg RDLs
Step‑ups (loaded, controlled)
Unilateral hamstring curls
Prioritize:
Moderate to heavy loads
Controlled tempo
Progressive overload
High movement quality
Final Takeaways
Single-leg training is not just a fitness trend.
For cyclists, it directly reflects the demands of the sport itself.
Cycling is an alternating, single-limb activity — and the research increasingly suggests unilateral strength training transfers extremely well to:
Endurance performance
Sprint power
Coordination
Neuromuscular efficiency
The goal is not replacing all bilateral lifting.
It is building a strength program that develops both:
General strength capacity
Cycling-specific force expression
And for many cyclists, unilateral training may be one of the missing links.