Laravel Database design and Eloquent query bottleneck - laravel

Question

I have designed a workout routine. This workout routine has a duration of 3 weeks and each week has 7 days. In these 7 days of each week, 3 of the 7 are rest days and each of the exercise days have multiple exercises. My problem here is how do I link the weeks, days and exercises. I am able to add exercise to days. I am also able to able to link the days to weeks but how to i link these to the exact workout id considering that Workout - Weeks has a many-to-many relationship, Week - Days has a many-to-many relationship and Days - Exercises has a many-to-many relationship.
Please find my store function implementation below
public function store(Request $request)
{
try {
$this->validate($request, [
'title' => 'required|unique:workouts',
'description' => 'required',
'goal_id' => 'required',
'level_id' => 'required',
'duration' => 'required',
'status' => 'required'
]);
if($request->hasFile('image')) {
// Upload an image file to cloudinary with one line of code
$image = Cloudinary::upload($request->file('image')->getRealPath())->getSecurePath();
}
$workouts = Workout::create([
'title' => $request->title,
'description' => $request->description,
'goal_id' => $request->goal_id,
'level_id' => $request->level_id,
'duration' => $request->duration,
'image' => $image,
'price' => $request->price,
'status' => $request->status
]);
$workouts->workout_bodypart()->sync($request->bodyparts);
$workouts->workout_equipment()->sync($request->equipments);
$weeks = array();
for($i = 1; $i <= $request->duration; $i++) {
$weeks[] = $i;
$workouts->workout_week()->sync($weeks);
}
for($j = 1; $j <= $request->duration; $j++) {
$weekDayWorkout = collect($request->week_.$j.'_day_1')->map(function($workouts) {
return ['workout_id' => $workouts->id];
});
dd($weekDayWorkout);
Week::find($j)->week_day_1()->sync(
$weekDayWorkout
);
// Week::find($j)->week_day_2()->sync($request->week_.$j.'_day_2', ['workout_id' => $workouts->id]);
// Week::find($j)->week_day_3()->sync($request->week_.$j.'_day_3', ['workout_id' => $workouts->id]);
// Week::find($j)->week_day_4()->sync($request->week_.$j.'_day_4', ['workout_id' => $workouts->id]);
// Week::find($j)->week_day_5()->sync($request->week_.$j.'_day_5', ['workout_id' => $workouts->id]);
// Week::find($j)->week_day_6()->sync($request->week_.$j.'_day_6', ['workout_id' => $workouts->id]);
// Week::find($j)->week_day_7()->sync($request->week_.$j.'_day_7', ['workout_id' => $workouts->id]);
}
if($workouts) {
return redirect()->route('workouts.index')->with('success', 'Workout added successfully!');
} else {
return redirect()->back()->with('error', 'Something went wrong');
}
} catch(Exception $e) {
return redirect()->back()->with('error', $e->getMessage());
}
}