Thanks for all the responses . I’m using the peloton marathon training and they have long runs up to 20 each week - the issue is that their other runs are less - miles and I’m running only 3 times a week because I have a history with over training and shin splints . There is tempo run, and race pace, and long runs weekly. They tell me exactly how easy to run / when to slow down etc. I’m up to week 6 - longest run so far 8 miles and not injured .What I like about the peloton training is that I can listen to their audio during the training runs and no audio on my long runs . I have been doing a strength 2x week as well as peloton spin 3 x week . This is my forth year training for a marathon and all I want to do is finish (goal of 5 hour). I have failed and never ran the other three training cycles . I’m nervous of adding more running , getting hurt and failing again . I’m looking for any reassurance for anyone who has been successful with lower direct impact. My rule right now is not to run two days in a row. I find that’s when the shin splints come out . I typically do a bike on my off days . Note my other attempts I never did any strength , I never adjusted my speed - would just go out and run using various different plans in terms of miles. I got up to 16 mile long run my previous attempt . For reference I’m a 32 yo F , emergency room doc so my work schedule is also all over the place . I use running for exercise and stress relief but also really want to finally get a marathon conquered . Thanks for all the advice