Constant fatigue: You're always tired, even after a good night's sleep.

Slow recovery: Your muscles ache for days after a run.

Frequent injuries: You're sidelined more often than you'd like.

Plateauing performance: Your times aren't improving despite consistent training.

Mood swings: You're irritable and your emotions are all over the place.

Weakened immune system: You catch every cold that comes around.