I am not a trainer but as an instructor, I warn players to be cautious about training to increase clubhead speed at the expense of great technique and rhythm/tempo. Club head and ball speed is something one can get obsessed with and lose their swing. My experience with swinging a heavy club or swinging light clubs fast both seem to have benefits.
Here’s my recommendations.
1. Look for gradual increases and be patient.
2. Seek expert advice (especially low/scratch players that compete) and be ready to pay for it.
3. Beware of social media.
4. Make flexibility and injury prevention your first priority. As players on tour/in college are hitting the ball so far it seems that more injuries are also occurring. You probably don’t want to risk injury or new chronic injuries to your golf or life.