I lost about 3″ in 2 weeks on iDave, and i was only a (tight) 36″ trouser to start with, now an Ok 34″.
Diet, follow it religiously, no cheeting
Every weekday evening: Join a Gym that does classes, no not spinning, you can do that easily, Zumba, body combat, pump, etc, if it’s easy then it’s not working, yoga/pilates count, but do some cardio afterwards.
Every weekday morning either swimming or rowing. Swimming, stick to simple drills like, 150m crawl warmup, 75m Bstroke, 75m Bstroke fast, 75m crawl, 75m crawl fast. Repeat for 30 minutes. Rowing, with a HRM row at a pace you can maintain for a while (slower than you think) then keep going as long as you can, rest for 2 minutes, then go again, keep going untill the total time is 30 minutes, the next day, row further in 30 minutes, etc.
Ride to work, if you have any energy left after that, ride into work.
Posture, breathe all the way in. Suck your belly in. Exhale out about halfway. Breathe like this for 3 minutes. Practice this whenever your not doing anything (bus stop, watchign tv, waiting for a pan to boil etc)