Is interval training the best training for heart health in seniors?
Best way to approach his is to do a fitness assessment on your client and from that you should be able to figure out if this type if training is for her. This is not for everyone, especially when it comes to seniors. Some can perform HIIT with no problems while others have health issues and limitations that will make it very difficult for them to get engaged in this type of training. The other professionals here have given you some great sources of information, but the final step is up to you and your client.