The Most Overlooked Muscle in Basketball Foot Training

The Most Overlooked Muscle in Basketball Foot Training

In recent years, basketball performance training has placed growing emphasis on strengthening the flexor hallucis longus (FHL). The logic is easy to follow. The big toe is visibly involved in propulsion, vertical jumping, and sprint acceleration. Because its contribution is obvious at takeoff, it has become the focal point of plantar training.

That focus, however, is incomplete.

On the plantar side of the foot, four of the five toes are controlled by the flexor digitorum longus (FDL). Only the hallux is controlled by the FHL. Yet in many basketball environments, nearly all training attention is directed toward 20 percent of the toes, while the remaining plantar system—responsible for the majority of force distribution and stability—receives minimal consideration.

This is not simply an anatomical oversight. It is a mechanical one.

Force Capacity Tells a Different Story

Projected force values from musculoskeletal modeling, while not direct in-vivo measurements, are useful for understanding relative contribution and guiding training priorities.

Within this framework, the flexor digitorum longus demonstrates an estimated force capacity of approximately 2,272 newtons (about 511 pounds). The flexor hallucis longus contributes roughly 437 newtons (about 98 pounds). In other words, the FDL possesses more than five times the projected force capacity of the FHL.

When viewed in broader context, the importance of the FDL becomes even clearer. Across the lower leg, only the soleus exceeds the FDL in predicted maximal force output. The FDL surpasses both heads of the gastrocnemius, despite receiving only a fraction of the training attention in basketball settings.

Different Muscles, Different Jobs

Functionally, the FHL and FDL serve distinct roles.

The FHL excels during clean, linear tasks. It supports terminal push-off, assists ankle plantarflexion, and contributes to straight-line acceleration and maximal vertical jumping. Because its role is most visible during takeoff, its importance is often overestimated in reactive, multi-directional movement.

The FDL plays a broader stabilizing role. By flexing toes two through five, it contributes to longitudinal arch integrity, midfoot stiffness, and the distribution of plantar pressure across the forefoot. During lateral cuts, defensive slides, deceleration, and off-balance landings, the FDL helps spread load across a wider base of support rather than forcing stress through the first ray and ankle complex.

A late close-out where an athlete lands slightly internally rotated is not a big-toe problem. It is a lesser-toe problem.

Basketball Is Not Linear

Basketball rarely rewards clean, straight-line mechanics. Most high-risk moments occur during reactive actions—closing out, recovering defensively, changing direction under fatigue, or landing off-balance after contact.

In these situations, force must be tolerated and redistributed across the entire foot, not funneled through a single structure.

When training disproportionately favors the big toe, athletes may develop impressive big-toe force production while lacking the capacity to tolerate force across the rest of the forefoot. This narrows the functional base of support and increases reliance on the ankle and first ray to manage loads they were never designed to handle alone.

Over time, this pattern can elevate stress on the Achilles tendon, plantar fascia, and lateral ankle structures—areas already vulnerable in basketball athletes.

Training the Full Plantar System

As understanding of foot and ankle biomechanics evolves, training priorities must evolve with it. In basketball environments where time is limited, prioritizing structures based on force capacity and functional relevance ensures a higher return on investment.

This does not require abandoning existing methods. It requires refining them.

Basketball athletes do not just need strong feet. They need a foot–ankle system capable of generating force, tolerating force, transferring force, and expressing force under chaotic, game-speed conditions.

When training commits to 100 percent of the plantar system—developing both the flexor digitorum longus and the flexor hallucis longus—the foot stops being a weak link in the kinetic chain and becomes a stable, adaptable platform for performance and durability across the season.