Vietnam's Track and Field and the Hamstring Verdict Written Before the Season

One morning in late March, while mist still clung to lane two of the National Sports Training Centre in Hanoi, I stood at the outside bend, where no one pays attention. A male athlete was running the last 150-metre rep of a speed set. At metre 120, his right heel landed nearly six degrees off the hip axis. I wrote the number in my notebook. No one on the coaching staff asked what I was doing. Exactly three weeks later, he left the session early, hand clutching the back of his thigh. No scream, only the coach's sigh. Every injury is a verdict; I am merely the one who reads it with my own legs. This time, the verdict was written before the season had even opened. Vietnam's athletics season follows the same rhythm every year. January is the conditioning block in Tam Dao and Da Nang. March brings the first speed sessions on the 400-metre track. April through June is a run of domestic meets, from the clubs' cup to the national championship. Then in July the whole national team converges on a single target. The annual season holds no glittering peak, yet that very steadiness is what wears down the hamstring fastest. In recent years I have followed the national athletics team's training camps closely. Hamstring injuries from March to May account for most of the cases that force athletes out of training. That figure does not come from some report. It comes from the notebook I have kept across many seasons, cross-checked against each group's schedule. When you place a crowded competition calendar beside each athlete's range of motion, a pattern emerges with uncomfortable clarity. Vietnamese athletics has a paradox of resources. We have middle- and long-distance runners among the best in Southeast Asia, yet the recovery support system is thin. A 3,000-metre steeplechaser may have to race several events at one meet, because the team needs medals in every event it can reach. The pressure for results pushes the calendar higher while recovery time is cut shorter. This is fertile ground for injury to breed. What draws my attention most is how people read data. A coach looks at a 100-metre time and sees progress. I look at the same time and see pressure loading the hamstring. When an athlete runs 0.2 seconds faster than last season, the force on the hamstring after each stride rises significantly. The body does not accelerate for free. Every added percent of speed is paid for with a percent of load on the posterior chain. The question is not whether the athlete runs faster, but whether their tendons and ligaments were prepared to bear that load. The hip-rotation coefficient never lies; only people insist on misreading it. When the hip rotates too much in the push-off phase, the hamstring is stretched to its longest and weakest position at the same time. That is when injury lurks. I have measured this index on many Vietnamese track-and-field athletes over the years. Those whose hip-rotation coefficient exceeds the safe threshold tend to develop hamstring problems within months if training volume is not adjusted. I do not prophesy; I only read the code the body has already written. Take competition volume as an example. A leading Vietnamese athlete may run three events at one national meet, then race again at a regional meet two weeks later. Each time they step onto the track, the body goes through a full load cycle. That total volume, accumulated over weeks, creates a debt the hamstring will collect with high interest. I often chart weekly load for each athlete. A line that climbs steadily is a good sign. A line that spikes and collapses is a warning. The hamstring is a two-phase load structure. In the landing phase it acts as a brake. In the push-off phase it acts as an engine. When training volume rises faster than the tendon's capacity to adapt, the braking phase becomes the weak point. At high speed, the hamstring can be stretched close to its tolerance limit in an instant. A missed plant, a late burst at the end of a session, can be the drop that spills the glass. I remember one season when a sprint group did repeated 60-metre reps with short rest intervals. The coach wanted to improve top speed. After two weeks, three of six athletes showed signs of hamstring strain. No one tore completely, but the whole group had to reduce load. Read the data carefully and you would see it coming: short rest did not let the tendon recover enough between runs, and high-quality volume piled up too fast. The problem was not the drill, but how it was distributed across the week. In the long jump and triple jump, the story is even clearer. Each landing after a jump produces ground forces many times body weight. The Achilles and hamstring bear pressure together. A triple jumper performs dozens of landings in one technical session. Multiplied across sessions, that number becomes a real threat. I once watched a young athlete drill landings repeatedly in a fatigued state, and an ankle injury appeared only days later. The body had sent its signal earlier; no one read it. The same holds for middle-distance events. An 800- and 1,500-metre runner alternates between interval and endurance work. The constant switching between two load types makes the hamstring and calf work across different intensity bands. If the coach does not adjust volume individually, the group will hit trouble together. I always stress to coaches that the group plan and the individual plan must be kept separate. A drill that is good for one athlete can be a verdict for another. Look at the calendars of the leading athletes and the pressure becomes plain. Nguyen Thi Oanh is famous for racing multiple events at SEA Games, from the 1,500 metres to the 3,000-metre steeplechase. Each event is a different load type piled onto the same pair of legs. Le Tu Chinh, once seen as Vietnamese athletics' sprinting hope, went through several stretches of struggle with injury in her career. Those stories are not isolated. They are the result of a system that demands more than the body was prepared to give. Injury is the one thing on the track that never bargains. It does not care whether you are a national champion or a young athlete newly called up. It cares only how far you prepared your body before asking it to do what exceeds its limits. Over many years in this trade, I have learned that most track-and-field injuries do not come from a single unlucky moment. They come from a chain of small, repeated decisions that no one stopped to read. There is one argument I always meet when working with teams. When an athlete shows signs of injury, one camp wants full rest for recovery. The other wants to maintain intensity so form is not lost. Both have their logic, and both are half right. Full rest costs load tolerance. Training on worsens the damage. The answer lies in adjustment, not stopping. I once proposed a method I call reverse deloading. Instead of tapering evenly, you raise intensity briefly and then cut it sharply, forcing the body to adapt at a new threshold before returning to normal. Many national-team doctors called it a con. I do not argue with words; I argue with monitoring results. The method does not suit every athlete, and I have never said it suits all. But it shows one thing: we are too rigid in how we think about recovery. The deeper problem lies in authority. When an athlete hurts, people usually ask the coach before they ask the data. But coaches have their own interests. Their results are tied to the athlete taking the field, not to the athlete staying healthy across a career. I am not saying they deliberately harm anyone. I am saying the structure encourages them to push athletes back sooner than the body permits. That is a blind spot of an entire system, not the fault of one person. What worries me is that when the season reaches its decisive phase, the pressure for results pushes medical decisions to the margins. An athlete may be given painkilling injections to make a meet in time, then pay with a worse injury later. I have seen this many times. The price of a medal is sometimes paid with years of a career. Vietnamese athletics is at a stage where it needs a system of personalised load monitoring, rather than relying on a coach's feel. A notebook tracking hip-rotation coefficient, stride amplitude and weekly training volume for each athlete could prevent more injuries than any seminar. The problem is not that we lack knowledge. The problem is that we lack the habit of measuring before the body speaks. The injury code has already been written into every stride. The only question left is who will read it before it is too late.