Been working out really hard for the past 3 months, lots of cardio and weight lifting. I have no more motivation to work out, getting on the treadmill or lifting weights feels like a choir now. I usually run 5-8 miles a day but I get bored after 1, I try and do some bicep curls and I can't get myself to do more than 5 than just go home. I've tried drinking some coffee but that didn't help. I have plenty of energy and eat healthy everyday. Any suggestions?