Does anyone have a good workout Regiment to prepare for 1st Special Forces Operational Detachment-Delta?

I'm going to go out on a limb and say that your former Drill Sergeant had no idea what she was talking about. Ranger Regiment and SF Community are polar opposites, you don't need to be airborne. What you do need to be is an NCO.

Forget everything that person said, they've certainly never been in Delta and probably never met anyone who has.

There are two routes for you as the enlisted person to try out for Delta. You can apply to be an enabler or an operator. Now, nothing stops you from applying to be an operator, but if you aren't coming from combat arms from 75th, or SF, or at the top of your peers in another high optempo unit, you probably won't be selected as an operator. If you want to be an operator, by all means, try out. Google the long walk /Delta and you'll see what you're up against. People's soles come off their feet from the blisters.

Chances are you're not interested in shooting bad guys in the face and runnin n gunnin, that you're the more sensitive sort who just wants to support at one of the highest optempo units in the world. The selection for support personnel is drastically different than the operators. While the operators of Delta are some of the most weirdly inhuman specimens of physical fitness, the enablers are not. Not to say they are not in shape, most of them are in great shape. Physical fitness events are part of the assessments. Most of the enablers I have known were either marathon runners, triathletes, or ultra marathon runners. None of them had particularly great times, but they all competed. But what they really had in common was that they were all smart, NCOs, independent problem solvers who were the best in their field at their job. So, if you want to join, learn your job inside and out. Learn your job like a warrant, learn the jobs of the MOS's that affect your job. Learn your job so that you could do it at an Air Force, or a navy base, or in the civilian sector with a GPC card. Delta doesn't need you to be the most physically fit 92A in the Army, they aren't going to fast rope you into a hot LZ on a CSAR mission. That might happen if you were in 75th Ranger Regiment, but Delta has plenty of trained personnel on standby, and Rangers to call on when things get bad. What they do need you to do is be the best 92 in the Army and fix problems they didn't even know would be problems, before they become problems. But, again you need to be an NCO first.

I don't know how much need there is for a 92A in Delta, there strengths aren't exactly publicized even on Army databases. If you are not selected for Delta, you can apply to JSOC. They have a section called SOLCE that does employ 92As, 91Bs, and 88s heavily.

SOFLETE, their selection prep program. It’s an app developed by former and current SOF dudes. Been using the app for over 2 years now. It’s awesome. 10 days for free, then pay the $360/year for full access. It’s cheaper in the long run than paying the $34/month.

https://mtntactical.com/fitness/

This company has tailored fitness programs to various military schools from people with expertise. You'll have to shell out a few dollars, but the programs are solid. I bought their ACFT plan years ago when we were all just started prepping for it.