I did W4/D1 last night and it murdered me, almost. I was very nervous starting this week since it's a huge jump from week 3 to 4 and the last 5 minute jogging stretch had me mentally beat that I was very tempted to stop jogging and walk for a bit. However, I pushed myself and did it!! I actually did it! Felt great finishing!! My legs were super sore afterwards but with a good stretch I was good to go.
I'm training to jog my first 10k and this app has been an amazing tool! It's true what people say, it's all mental. Pacing myself has also helped tremendously! Although my pace isn't great I am seeing an improvement each week and that's a huge motivator!