You need to do some mobility work—or better yet, have someone do it for you like an Active Release Techniques practitioner or a massage therapist. You also need to be aware that if you spend more minutes on mobility exercises everyday than you are in years old you are overdoing it. Time is of the essence for all of us, so be smart with it. You are better off putting the bulk of your energy into your triathlon training rather than rolling around on the floor all day.
Make sure to focus on your specific problem areas: upper back, lower back, shoulders, knees, calves or feet. Focus on those spots, as well as areas above or below them. Your past injuries should always be addressed each session or each week.