If you are experienced and praticed in the basics of strength training, and are a member of a gym, sign up for a class to help with interval-based strength such as a boot camp, P90X, or body pump. If you do not have a gym membership, and do not want to pay out for classes, then you can easily achieve the same results at home. All you have to do is to purchase some kettlebells or free weights, and conduct specific exercises which simultaneously stress multiplex muscle groups. Examples of this include: dead lifts on single legs, kettlebell swings, bicep curls and alternating lunges.
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If you are new to this form of activity, doing weight exercises with weights at home and taking part in jumps in a class for high-intensity intervals is not recommended as it could result in injury. To that end, the wisest thing to do is to begin with body weight exercises prior to moving on to resistance training. Planks and push ups are excellent exercises for this purpose.
You could start off with squats, and then do them for several weeks. After this period of time, you can step up to doing a few weeks of body squats sitting on a gym ball, or you could hold a gym ball above your head. After that, you could progress to doing squats holding a bar.
If strength work is new to you, you could pay for a few lessons with a personal trainer. This is a very good idea, as they can make sure that you are not doing anything injurious to your body, and that you are conducting befitting exercises using the correct resistance and intensity, and that you are applying good form.
If you are on a limited budget, remember that you can always hire the trainer at certain intervals, so that they give you a program, and you practice it while you are not under their supervision, and then they give you more programs at a later date.