Double T for a 17 year old

Marius Bakken was asked in a interview when someone should start doing doubles -> and he answered that when you are running 6-7 times a week, it starts to make sense.

During winter, one session with hills 2 x 10 x 30sec is what pretty much what most top european 1500-5000 guys does as their vo2max/speed session. So i think that one such session should be enough. (They also do some 100m strides on one easy day and some 200m strides on another easy day).

*and they run all threshold sessions as intervals.

Your mileage progression is pretty rapid. You’re progressing really well from just doing easy mileage. Do you run for a team or are you just winging it?

my gut says stay with one threshold session per week until you’ve maxed out your gains from that.

throw in some hill sprints. Something like 6x60 meters on a steep hill with a walk back to the start.

I do it on my own lol my body seems to adapt to endurance training well

Yeah, in that case, I'd say stick with the 70 mpw, mostly easy. Once a week, throw in a 4-5 mile hard ish run. Once a week, do sprints. When you've maxed that out, investigate doing a second session of hard ish stuff. Based off of your 1500 speed, aim for something like 5-7 x 1000 at about 3:20-3:30 with 1 min recovery. Don't be afraid to start small when you add this and don't be in a rush to get there.

The other option is if you like to race, just start running more races in addition to your sprints and tempo runs. That would give you the second hard stimulus you're looking for.

Your schedule might look like this.

Mon: Tempo

Wed: Sprints

Thu: Long

Sat: Threshold intervals or Race. Fill in the mileage as needed.

Don't go here for a while though. Add the sprints first. You might actually want to find a coach.

Don't do double t. Including something like that this early in your running career will only get you injured. 5 years or so down the road, sure but doing it now would be incredibly stupid. Start with 1 threshold day, then go to 2, then add an uptempo long run and go from there. In order to get the benefits of double t you need a full aerobic base plus 90+ miles a week in singles.

I did it 3 times already and I seem fine really but my appetite has increased a lot

A weekly training split for me looks like this:

Mon

Recovery run or double recovery run usually for an hour

Tues

Am-Longer threshold like 5x6 mins at 80%

Pm-Shorter threshold like 12x400m around 85%

Wed

Am-Recovery run

Pm-Rest or run but less than 1 hour

Thurs

Am- Base run

Pm- Speed work like at 100m race pace to enhance basic speed

Fri

Am-Specific endurance training like 5x1000m or 10x300s at mile speed

Pm-Recovery run

Sat

Am- Gym or Hills

Pm- Recovery run

Sun

Long run usually 90-120 minutes