my quads seem to be lagging?

[Wuajsei]

I had a meeting with a personal trainer and he took a look at my physique and he said that my quads are my weak spot. He suggested I train more legs and his 2 exercises he likes are leg extensions and box squats. We did a session and I paid him and I told him I would be training on my own as I could not afford to pay $70 a session
what other exercises would you suggest I do? I’m not a fan of box squats at all, they bother my back too much.

 

[Arabian]

Box squats should not hurt your back if you're using proper form.

 

[wootoom]

I would post the picture online of your form. Maybe that's your issue.

 

[2Thick]

Leg extensions would work. Good. You can try those.

 

[CEO]

bros i would do deadlifts. they are a good workout routine

 

[ROIDDERS]

front squats would work great. i think planting properly though and make sure back is straight

 

[chesty]

you will get good results on leg pressing
Up this way, your back has support.

 

[Ulter]

You need to keep your spine straight. That's why your back is hurting.

 

[Mobster]

What are you doing right now?