Q.How does the knowledge of biomechanics help in improving technique and preventing injuries in sports?

Biomechanics applies the laws of mechanics to human movement. In sports, this knowledge acts as a diagnostic and corrective tool. By analysing the forces, angles, and velocities involved in a movement (like a cricket bowling action or a basketball jump shot), a coach can identify inefficiencies. For example, a swimmer whose hand enters the water at the wrong angle creates drag instead of propulsion. Biomechanics quantifies that drag, allowing the coach to prescribe a specific angle change that reduces resistance and increases speed without requiring more effort from the athlete. …

Biomechanics is the science that examines the internal and external forces acting on the human body and the effects those forces produce. For a coach or athlete, it is the bridge between raw effort and refined performance. Without understanding how force, leverage, and motion interact, training becomes guesswork — and guesswork leads to both plateaus and injuries.

How biomechanics improves technique

Every sport skill — a cricket fast bowler's run-up, a basketball jump shot, a weightlifter's clean and jerk — is a sequence of coordinated movements. Biomechanics breaks that sequence into its mechanical components: joint angles, segment velocities, ground reaction forces, and timing.

Force production and summation of forces. The principle of summation of forces states that to generate maximum force at the point of release or impact, the athlete must sequentially activate body segments — starting from the largest, strongest muscles (legs and hips) and transferring momentum through the trunk to the smallest, fastest segments (arm and hand). A tennis serve that begins with the shoulder instead of the legs loses power and strains the rotator cuff. Biomechanical analysis reveals the correct sequence, allowing the coach to cue the athlete to "drive from the ground up."

Optimal joint angles. Each joint has a range of motion that produces peak force or speed. For a sprinter, the optimal knee drive angle at toe-off maximises horizontal velocity while minimising braking forces. For a javelin thrower, the release angle of about 30–35° (relative to horizontal) balances distance with aerodynamic stability. Biomechanical measurement — even simple video analysis with angle overlays — lets the athlete adjust their body position to hit these mechanical sweet spots.

Energy conservation and efficiency. In endurance sports like distance running or cycling, small inefficiencies compound over thousands of repetitions. A runner who overstrides (foot landing ahead of the centre of mass) creates a braking force with every step, wasting energy and increasing impact loading. Biomechanics teaches the athlete to maintain a cadence of about 170–180 steps per minute with the foot landing under the hip — a pattern that stores and returns elastic energy in the Achilles tendon rather than dissipating it as heat and shock.

How biomechanics prevents injuries

Injuries in sport rarely come from a single catastrophic event — they accumulate from repeated microtrauma caused by faulty mechanics. Biomechanics identifies the fault before the tissue fails.

Load management and tissue tolerance. Every joint and tendon has a load tolerance. When an athlete performs a movement with poor alignment — for example, a squat with the knees caving inward (valgus collapse) — the patellofemoral joint experiences uneven compressive forces that can lead to patellar tendinopathy or chondromalacia. Biomechanical analysis quantifies the joint moments and shear forces, allowing the coach to modify stance width, foot angle, or depth to keep loads within safe limits.

Identifying asymmetries. Many overuse injuries stem from left-right imbalances. A basketball player who always lands from a jump on the same leg develops a strength and coordination asymmetry that overloads that hip and ankle. Biomechanical screening — such as a single-leg squat test or force-plate jump assessment — reveals a difference of more than 10–15% between sides. Corrective exercises then target the weaker side, restoring symmetry and reducing injury risk.

Shock absorption and landing mechanics. In sports with jumping and cutting (volleyball, basketball, netball), anterior cruciate ligament (ACL) injuries are common. Biomechanics research has shown that landing with the knee in a stiff, extended position and the foot flat increases ACL strain dramatically. Teaching athletes to land with soft knees (flexed 30–60°), hips back, and weight on the forefoot reduces peak ground reaction forces and shifts the load from ligaments to muscles. This is not guesswork — it is applied mechanics. …