After training for 14yrs here is what I can tell you;
1) COMMIT to giving it your all for at least 30 days (it takes 21 days to create a habit)
2) You MUST workout more than 2x week to see results, and RESULTS are what motivates you to keep going
3) WORK HARD!! You have to put the effort in to get what you want out of it. Everyone is different what their "all" is but if you want to see a change you gotta WORK for it. You will feel tired, sore sometimes, and like jelly BUT you will also feel PROUD, ACCOMPLISHED and MOTIVATED because you will be able to lift more weight, go for longer cardio, hold a plank for longer, not be as out of breath in everyday life and just have ENERGY!!