How do I get my GF to finish? /u/Altruistic-Mix-9423 Sex

My new GF says she can count the amount of times she finished with one hand. She says all of the times it happened was a random stroke of luck. She can’t really pin point what it was that gets her there. I’ve tried heavy foreplay and oral simulation but it doesn’t seem to do it for her. The one time I was close I tired out before she could reach that point. It seems like she likes it very rough but it’s either I finish before it happens or I get too tired and cannot continue. What other methods should I try? I feel like my only option is to hit the gym and start heavily training cardio. Any advice would be appreciated!

My new GF says she can count the amount of times she finished with one hand. She says all of the times it happened was a random stroke of luck. She can’t really pin point what it was that gets her there. I’ve tried heavy foreplay and oral simulation but it doesn’t seem to do it for her. The one time I was close I tired out before she could reach that point. It seems like she likes it very rough but it’s either I finish before it happens or I get too tired and cannot continue. What other methods should I try? I feel like my only option is to hit the gym and start heavily training cardio. Any advice would be appreciated!