It can be difficult to find the motivation to workout. Once you do get going, it can also be easy to fall off if you don't have anyone to hold you accountable for quitting. People can justify letting themselves down but most people hate to let a fellow friend down. Which is why it may be in your best interest to get a workout partner.
Someone who will push you and keep you on track. Someone who will also give you an earful if you keep cancelling workout sessions. It also works both ways. You are giving them the same encouragement and focus to keep bettering themselves. Iron sharpens iron and if you feel like a dull blade by yourself then its time to call that friend.