By Mark Chen — Got injured three times in two years. Changed how he trained. Has not been injured since.
Last updated: June 2026
You train hard. You get injured. You rest. You recover. You train hard again. You get injured again.
This cycle is frustrating. It is also preventable.
Most injuries are not bad luck. They are predictable. Here is why you keep getting hurt and how to stop.
The Real Causes of Injury
Doing too much, too soon.
This is the #1 cause of injury. You increase weight, mileage, or intensity too fast. Your body cannot adapt quickly enough. Something breaks.
The 10% rule: Do not increase weekly volume by more than 10%. Running 10 miles this week? Run 11 next week. Lifting 100 pounds? Try 110.
Skipping rest days.
Your body gets stronger during rest, not during workouts. No rest days means no adaptation. It also means accumulated fatigue. Fatigued muscles compensate poorly. Compensation leads to injury.
Ignoring pain.
Pain is information. Sharp pain during exercise is not “weakness leaving the body.” It is your body saying stop. Ignoring it turns a small problem into a big one.
Muscle imbalances.
Some muscles are strong. Some are weak. The weak muscles cannot keep up. Other muscles compensate. Compensation leads to injury.
Example: Weak glutes + tight hips = lower back pain. Your back is doing work your glutes should be doing.
Poor form.
You lift with your back instead of your legs. You run with your feet slapping the ground. You squat with your knees caving in. Bad form loads the wrong structures. They break over time.
Not warming up.
Cold muscles tear more easily. Cold joints move less smoothly. A 5-10 minute warm-up prevents injuries. Skipping it invites them.
The Most Common Injuries by Sport
| Sport | Common Injuries | Main Cause |
|---|---|---|
| Running | Runner’s knee, shin splints, plantar fasciitis | Too much, too soon. Weak hips. |
| Weightlifting | Lower back, shoulder, rotator cuff | Poor form. Ego lifting. |
| Soccer/Basketball | Ankle sprains, ACL tears, hamstring strains | Sudden direction changes. Fatigue. |
| Tennis | Tennis elbow, shoulder tendinitis | Repetitive motion. Poor technique. |
| Swimming | Swimmer’s shoulder | Overuse. Poor form. |
Most injuries are not from one big accident. They are from small stresses repeated over time.
How to Stop Getting Injured
Follow the 10% rule.
Do not increase weight, distance, or time by more than 10% per week. This is boring. It works.
Take rest days.
At least one day per week of complete rest. One or two days of light activity (walking, stretching). Hard days followed by easy days.
Warm up properly.
| Phase | Time | Activity |
|---|---|---|
| 1 | 5 minutes | Light cardio (jog, bike, jump jacks) |
| 2 | 5 minutes | Dynamic stretching (leg swings, lunges, arm circles) |
Do not skip this. Do not stretch cold muscles. Warm up first.
Cool down properly.
| Phase | Time | Activity |
|---|---|---|
| 1 | 5 minutes | Light cardio to bring heart rate down |
| 2 | 5-10 minutes | Static stretching (hold 15-30 seconds) |
Listen to pain.
| Pain Type | Action |
|---|---|
| Dull ache, muscle soreness | OK to train lightly. |
| Sharp pain during exercise | Stop. Rest today. |
| Pain that gets worse during exercise | Stop. See a doctor. |
| Pain that wakes you up at night | See a doctor. |
| Pain that lasts more than a week | See a doctor. |
Strengthen weaknesses.
Most runners have weak glutes and hips. Add hip thrusts, clamshells, and side leg raises.
Most lifters have weak rotator cuffs. Add external rotations and face pulls.
Most desk workers have tight hips and weak glutes. Add glute bridges and hip flexor stretches.
Fix your form.
Record yourself exercising. Compare to correct form on YouTube. Hire a coach for a few sessions. Better to pay for coaching than to pay for physical therapy.
The Difference Between Soreness and Injury
| Good Sore | Bad Pain | |
|---|---|---|
| Sensation | Dull ache | Sharp, stabbing |
| Timing | 12-24 hours after exercise | During exercise or immediately after |
| Location | Throughout the muscle | One specific spot |
| Movement | Feels better with light movement | Feels worse with any movement |
| Duration | 2-4 days | More than a week |
Soreness is fine. Pain is not.
A Sample Injury-Prevention Week
| Day | Workout | Notes |
|---|---|---|
| Monday | Hard workout | Run, lift, or sport |
| Tuesday | Easy workout | 50% intensity |
| Wednesday | Hard workout | Run, lift, or sport |
| Thursday | Active recovery | Walk, stretch, foam roll |
| Friday | Hard workout | Run, lift, or sport |
| Saturday | Easy workout or rest | Listen to your body |
| Sunday | Rest | Complete rest |
Hard days followed by easy days. Rest days scheduled. Active recovery built in.
When to See a Professional
| Professional | When to See |
|---|---|
| Physical therapist | Pain lasting more than a week. Recurring injuries. |
| Sports medicine doctor | Sharp pain. Joint pain. Suspected tear. |
| Coach or trainer | Poor form. Muscle imbalances. |
Do not keep doing the same thing and expecting different results. If you keep getting injured, something needs to change.
The Bottom Line
Most injuries are not accidents. They are predictable. Too much, too soon. Skipping rest. Ignoring pain. Muscle imbalances. Poor form.
The good news: all of these are fixable.
Train smarter, not just harder. Warm up. Rest. Listen to your body. Fix your weaknesses.
Injuries will always happen sometimes. But they do not have to keep happening.
About the author: Mark Chen got injured three times. He changed how he trains. He has not been injured in years. He learned the hard way so you do not have to.
This article is for informational purposes. If you are injured, see a doctor. Do not rely on internet advice for medical problems.
