diff --git a/app/Models/GymSession.php b/app/Models/GymSession.php
new file mode 100644
index 0000000..a8c0c8a
--- /dev/null
+++ b/app/Models/GymSession.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * @property int $id
+ * @property int $character_id
+ * @property string $stat
+ * @property int $sessions_today
+ * @property \Illuminate\Support\Carbon $reset_date
+ */
+class GymSession extends Model
+{
+    protected $fillable = [
+        'character_id',
+        'stat',
+        'sessions_today',
+        'reset_date',
+    ];
+
+    protected $casts = [
+        'reset_date' => 'date',
+    ];
+
+    public function character(): BelongsTo
+    {
+        return $this->belongsTo(Character::class);
+    }
+}
diff --git a/app/Services/Game/TrainingService.php b/app/Services/Game/TrainingService.php
new file mode 100644
index 0000000..a6f37f8
--- /dev/null
+++ b/app/Services/Game/TrainingService.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace App\Services\Game;
+
+use App\Models\Character;
+use App\Models\GymSession;
+
+class TrainingService
+{
+    private const VALID_STATS = ['strength', 'defense', 'speed', 'dexterity'];
+
+    public function train(Character $character, string $stat): array
+    {
+        if (!in_array($stat, self::VALID_STATS, true)) {
+            return ['success' => false, 'message' => 'Invalid stat.', 'stat_value' => 0];
+        }
+
+        $energyCost = config('game.gym.energy_cost', 20);
+        $dailyCap   = config('game.gym.daily_cap', 5);
+        $statGain   = config('game.gym.stat_gain', 1);
+
+        if (!$character->hasEnergy($energyCost)) {
+            return [
+                'success'    => false,
+                'message'    => "Not enough energy ({$energyCost} required).",
+                'stat_value' => $character->$stat,
+            ];
+        }
+
+        $sessionsToday = $this->getSessionsToday($character, $stat);
+
+        if ($sessionsToday >= $dailyCap) {
+            return [
+                'success'    => false,
+                'message'    => "Daily training cap reached for {$stat} ({$dailyCap} sessions).",
+                'stat_value' => $character->$stat,
+            ];
+        }
+
+        // Deduct energy
+        $character->consumeEnergy($energyCost);
+
+        // Increment stat
+        $character->$stat += $statGain;
+        $character->save();
+
+        // Upsert gym_sessions row
+        $session = GymSession::firstOrNew([
+            'character_id' => $character->id,
+            'stat'         => $stat,
+        ]);
+
+        if (!$session->reset_date || $session->reset_date->lt(today())) {
+            $session->sessions_today = 0;
+            $session->reset_date     = today();
+        }
+
+        $session->sessions_today += 1;
+        $session->save();
+
+        return [
+            'success'    => true,
+            'message'    => ucfirst($stat) . " increased to {$character->$stat}!",
+            'stat_value' => $character->$stat,
+        ];
+    }
+
+    public function getSessionsToday(Character $character, string $stat): int
+    {
+        $session = GymSession::where('character_id', $character->id)
+            ->where('stat', $stat)
+            ->first();
+
+        if (!$session || $session->reset_date->lt(today())) {
+            return 0;
+        }
+
+        return $session->sessions_today;
+    }
+
+    public function getSessionsRemaining(Character $character, string $stat): int
+    {
+        $cap = config('game.gym.daily_cap', 5);
+        return max(0, $cap - $this->getSessionsToday($character, $stat));
+    }
+}