Hi all! New to this forum. I've just completed W4R3 today, very pleased with myself for managing 5 min runs! My problem is that I have to run really slowly. Currently training at the gym, as have slightly dodgy knees and running outside on changing terrain was causing issues, so thought it best to try to stick to the program and build up stamina by running on the machine. But I can only manage my runs at 7.5kmph, I honestly think I could walk faster! Is it worthwhile running at this speed?